My son loves to play video games on his Xbox. He is about to drive me crazy playing Fortnight all of the time.
I don't blame him! Game consoles developed by Microsoft are of such high quality that they can be addicting!
It is very addicting, but that game causes so much anger and I hate hearing him mad at a stupid game. They are a great form of communication though.
You should introduce him to some of the streaming services offered on xbox, so he might stop playing that fortnite game!
Oh, he loves to watch his videos on his xbox also. Especially the ones about Fortnight. LOL
Yes its a co-op sandbox survival video game, so its easy to see why he might watch video to increase his chances of winning. 
He also likes to play basketball on his xbox. Youtube and Fortnight are his main forms of using it though.
I would suggest he also buy No Mans Sky. Its an action-adventure survival video game which will help him relax.