@IMMORTALSx there are multiple mapvote, at least 2 but I can recommend mine, it's really easy to use and everything is documented
https://forum.plutonium.pw/topic/25896/mp-zm-black-ops-ii-mapvote
On the other hand if you want a completely random rotation each game without giving players a choice you could use this IW4MAdmin plugin (requires IW4MAdmin)
https://forum.awog.at/topic/170/release-dynamic-map-reservoir