Also note that this only works for dedicated servers.
You can still run the script in a private match to get a preview of the colors and everything but it won't rotate to your chosen map/mode due a technical limitation.

This is heavily inspired by LastDemon99's IW5 mapvote.
I also re-used some code from DoktorSAS T6 mapvote.
Huge thanks to both of them.

mapvote.gsc

This script can either be installed in the scripts folder or in the scripts\mp folder.
IMPORTANT Installing mapvote_mp_extend.gsc in scripts\mp is mandatory to make the mapvote work normally.

Main features

It allows up to 6 maps and 4 modes to be displayed at once
It has separate map and mode choices
It supports custom gamemode names and custom cfg
It rotates a completely random map and mode when there are no votes
It has a good level of customization
It has a debug mode to quickly preview the menu

Getting started

By default the script is disabled to avoid running on all your servers.
Simply set mapvote_enable to 1 and the script will be loaded, which as a result will display the voting menu after the killcam.

To configure the menu before putting it on your server I recommend running it in a custom game with the mapvote_debug dvar set to 1.
To do that use this command in the console set mapvote_enable 1;set mapvote_debug 1 before running a custom game.
Start a custom game and pick any class and you will see the menu. Everything will work but map rotation which is normal.
You can then configure the dvars directly in your console and restart the map with map_restart in the console to edit the menu quickly and get your perfect setup.

Dvars

Here are the dvars you can configure:

Name	Description	Default value	Accepted values
mapvote_enable	Toggle whether the mapvote is activated or not. 0 is off and 1 is on	0	0 or 1
mapvote_debug	Toggle whether the mapvote runs in debug mode or not. This will display the mapvote menu a few seconds after starting the game. 0 is off and 1 is on	0	0 or 1
mapvote_maps	A list of the maps that are available for rotation. Each map name needs to start with a capitalized letter and each map is separated with :	Every BO2 maps including DLC maps	Any map name, starting with a capitalized letter and separated with a colon (:)
mapvote_modes	A list of the modes that are available for rotation. The first parameter is how the mode will be displayed, it can be set to anything you like, the second parameter is the name of the cfg file to load found in the gamesettings folder	"Team Deathmatch;tdm:Domination;dom:Hardpoint;koth"	Any name you want followed by a semi-colon (;) with the cfg name and separated with a colon (:)
mapvote_colors_selected	The color of the text when hovered or selected. This is also the color of the votes count	"blue"	red, green, yellow, blue, cyan, purple, white, grey, gray, black
mapvote_colors_unselected	The color of the text when not hovered and not selected	"white"	red, green, yellow, blue, cyan, purple, white, grey, gray, black
mapvote_colors_timer	The color of the timer as long as it has more than 5 seconds remaining	"blue"	red, green, yellow, blue, cyan, purple, white, grey, gray, black
mapvote_colors_timer_low	The color of the timer when it has 5 or less seconds remaining	"red"	red, green, yellow, blue, cyan, purple, white, grey, gray, black
mapvote_colors_help_text	The color of the help text at the bottom explaining how to use the menu	"white"	red, green, yellow, blue, cyan, purple, white, grey, gray, black
mapvote_colors_help_accent	The color of the accented text of the help text at the bottom	"blue"	red, green, yellow, blue, cyan, purple, white, grey, gray, black
mapvote_colors_help_accent_mode	The accenting mode for the help text. only puts the accent color on the button to press and puts it on both the buttons and the action it does	"standard"	standard or max
mapvote_vote_time	The time the vote lasts (in seconds)	30	Any plain number above 5
mapvote_blur_level	The amount of blur to put at the end of the killcam. The max recommended value is 5. 0 disables it	2.5	Any number
mapvote_blur_fade_in_time	The time (in seconds) it takes for the blur to reach <mapvote_blur_level>. For example if you set it to 10 and <mapvote_blur_level> is 5 then it will progressively blur the screen from 0 to 5 in 10 seconds	2	Any number
mapvote_horizontal_spacing	The horizontal spacing between the map/mode names on the left and the vote counts on the right. I recommend setting this value according to your map and modes length so that it doesn't overlap with the vote counts	75	Any plain number

Configuration

Below is an example CFG showing how each dvars can be configured.
The values you see are the default values that will be used if you don't set a dvar.

set "mapvote_maps", "Aftermath:Cargo:Carrier:Drone:Express:Hijacked:Meltdown:Overflow:Plaza:Raid:Slums:Standoff:Turbine:Yemen:Nuketown:Downhill:Mirage:Hydro:Grind:Encore:Magma:Vertigo:Studio:Uplink:Detour:Cove:Rush:Dig:Frost:Pod:Takeoff"
set "mapvote_modes", "Team Deathmatch;tdm:Domination;dom:Hardpoint;koth"
set "mapvote_colors_selected", "blue"
set "mapvote_colors_unselected", "white"
set "mapvote_colors_timer", "blue"
set "mapvote_colors_timer_low", "red"
set "mapvote_colors_help_text", "white"
set "mapvote_colors_help_accent", "blue"
set "mapvote_colors_help_accent_mode", "standard"
set "mapvote_vote_time", 30
set "mapvote_blur_level", 2.5
set "mapvote_blur_fade_in_time", 2
set "mapvote_horizontal_spacing", 75

Here are some pre-set values if you want to quickly copy/paste something

Description	Value
All base game maps	"Aftermath:Cargo:Carrier:Drone:Express:Hijacked:Meltdown:Overflow:Plaza:Raid:Slums:Standoff:Turbine:Yemen"
All DLC maps	"Nuketown:Downhill:Mirage:Hydro:Grind:Encore:Magma:Vertigo:Studio:Uplink:Detour:Cove:Rush:Dig:Frost:Pod:Takeoff"
Classic modes	"Team Deathmatch;tdm:Domination;dom:Hardpoint;koth"
Objective modes	"Demolition;dem:Headquaters;hq:Capture the Flag;ctf"
Alternative modes	"Kill Confirmed;conf:One Flag CTF;oneflag"
Party modes	"Gun Game;gun:One in the Chamber;oic:Sharpshooter;shrp:Sticks & Stones;sas"
FFA 24/7	"Free for All;dm"
SND 24/7	"Search & Destroy;sd"

Notes

When two maps/modes have the same votes, the lowest one in the list will win. In the future it would be nice to randomize between both
Ending the game with ESC doesn't work when in debug mode. Use map_restart in the console when your script is compiled. And if you want to leave use disconnect in the console until this is fixed
When there's only one map/mode the right map/mode will be chosen but adding an option to hide single vote elements would be nice

mapvote_mp_extend.gsc

A small script that goes with mapvote.gsc to make it work in multiplayer.
It has to be installed in the mp directory since it contains multiplayer only code.
Putting it in scripts or scripts\zm will throw an error when booting up a zombies map.