How do you obtain rights to use video games on youtube and make money from them?

Hi! I want to do game 'Let's Play's on youtube, but I want to do it legally. How? I know you have to obtain rights and documents saying you can use it to make money, but how? Is there certain sites I go to? How much does it averagelly cost? An example for me would be Minecraft. Please give me as much info as you can, thanks.How do you obtain rights to use video games on youtube and make money from them?
hi i found this awesome page! is so good!!! i cant tell you about how to get money! but how to get suscribers!!! the name of the page is www.subxcess.com and you can earn like 25 subs per 2 hours and when it gets more fameous the page you will sure earn like 200 per hour XD seriosly is so good page they made it 4 days a ! go thats why its not so much people on it! but if you go to the chat you find like 7 people every time to chat about s4s and you can sub and get points, and that makes you better so people can sub ya! chek it out is a awesome page! ;) se yaHow do you obtain rights to use video games on youtube and make money from them?
contact the company that makes the game



and uh, good luck, you'll need it