Hotline Miami, Shadow Warrior and Serious Sam publisher Devolver Digital is totally cool with you taking videos of its games and making money off them, and has communicated this with its trademark humour.
On a dedicated website, the publisher answered the question stridently; keep hitting refresh until you’re told to go away.
Many YouTube creators capture game footage for walkthroughs or Let’s Play, and earn income from ads shown. Many Twitch users have monetised their streams, too.
Some publishers are less keen on this sort of thing, as for example Nintendo’s recent dummy spit.