Basically you want to do this right?
https://www.youtube.com/watch?v=ne2kAqrB4Tg
I don't know how to do it with your tool, but note that it could get you into trouble as you would clearly be pirating your sponsors content and profiting from it without respecting their copyright.
They could forfeit all your earnings as well as sue you directly for misusing their content or not respecting their rights.
I wouldn't do it. Watermarks are there for a reason.