Most computer games are copyrighted, so although you can use these, you will usually not get the revenue.



  Like copyrighted music, the revenue will go to the copyright owner.


 YouTube has updated the rules for games.



  https://support.google.com/youtube/answer/138161?hl=en


 My view is to avoid using games, please, especially as there are many professional channels and these
  have access to the latest games with copyright clearance, whereas you will only usually have access to older games, you will have difficulty making a sensible video from different creators and you may not be able to monetise them.