As you already offer free video content, apart for specific niches, the best converting programs will be cams and dating to offer your visitors something real.
For the dating part,
Ashley Madison pays up to $200 per membership (PayPal supported), and
Fling and MeetLocals pay a flat $35 per sign-up (you can get paid more per sign-up if you send more during the same pay period though).
For the cam part,
Livebucks is a good program: $35 per join, up to $100 depending on the traffic, and Payoneer as a payment option.