Sounds to me like he will probably never start this process of changing on his own, he needs a push of the ledge so to say.. - Think about Bungee jumping.

If you're not happy with the current situation, let him know that there are two options where the other one is him continuing on the path he's on but alone or you two, together, start working towards his goals, whatever they may be. It's all about babysteps and you need to be there for him - There's reason people pay for personal trainers. Since he has developed a habit, it's even harder. So push a bit harder.

Since he is talking about doing videos to youtube about games, why not start making videos but not upload them anywhere etc? This way his skills would improve and it would be a step forward. Who knows where he could end up with good editing skills? If this is too much of a step, he could just try to edit some random videos from the internet. There's always a way.

Also there is this one guy here in Steemit making those kinds of videos, Only one guy, so I'd say there is a vacuum right now. Also steemit, thanks to how it is setup, offers a quite troll free environment compared to youtube. Just disable comments in youtube and he'll get positive critique, which we all need from time to time.

I tried to look up this video of Casey Neistat which I remember watching, he's a videoblogger on youtube who has made it big over there. Sadly I couldn't find it but in it he was talking of his journey to fame and money. He had blogged for years and really didn't gather enough traction to live of it, but once he decided to fuck it and go all in, as in starting to make videos every single day, something changed and his channel started to gain more and more subscribers. It still took a long time but he is killing it now. So better start, like, today :)

This comment kind of blew up and I didn't even get to mention how Steve Jobs got FIRED from his own company. That must have hurt like hell, but he kept on doing what he had passion for and the rest is history. So even if you get struck down it is your choice if you get up or stay down. Yep, cheesy but isn't it true?

Okay, now I'm done. I hope you two can work it out! Good luck.