You pretty much search for videos in your niche, that have no description.

You make a video about the thing you wanna promote to make money, how you make money, and what the people have to do to make you money.

After that, you find videos that have no description, and contact the uploader. Offering them a partnership and giving them 50% of the revenue.

Rinse and Repeat with other videos and niches.

Only problem though, YouTube's design is so crappy. When you send someone a message, they don't even notice that they have one ._. Last time I checked my inbox, i had messages from 2011 and last year that I didnt even know about.

I would just use a Top Commenter bot or something, to get your message to the people. Because the hardest part is getting the uploader to notice that you're trying to talk to them.

download
Code:
http://www5.zippyshare.com/v/24345567/file.html