So wait, how is it different if you film a game?
It's not about what you film.
You could make a film that includes someones house, but they couldn't sue you for using their house like that.
The reason they can prosecute you for filming a game, is because a game is already a piece of media belonging to someone else.
This is in the sense of it being someone elses product.
It's the same as you buying a brand of liquid soap, pouring it in a different bottle, labling it as yours and selling it on.
It's illegal and claiming someone elses product as your, regardless of if you make money out of it or not.
You filming gameplay or filming a movie, is re-recording someone elses media creation and publicly hosting it to the world for anyone to see, without giving information that it belongs to the original creator nor is it providing royalties to the creator, which the creator deserves for creating it.
And you can't get sued for filming someone elses property if it's not a trademark or copyright.
Your example of filming your friend house isn't illegal, because that house isn't a trademark of him or his business, nor is it a creative object of his, nor is it a patented or copyrighted idea of his.