game help

Hey guys, I'm still a new youtuber, so I would really appreciate your input here, because I'm experimenting with something on my channel. So I've created a series called The Double Agent Diaries, where I'm telling a story (improvising) of a spy on a mission undercover as a nanny in 30s-1min...

So i'm going to start adding a bit of game play footage to my channel. How do I go about getting permission for the games i play? I was told to contact devlopers. I'm not sure exactly how to go about that. I'm new to gaming area on youtube and i don't want to have any strikes on my channel. Any...