Video must be about space or about biotechnology. When I say "original", that is not the same as saying amateurish or badly made. I don't expect Stanley Kubrick's "2011: a space odyssey" or a PBS documentary on a shoestring budget (although that would be nice) but I do expect your best effort at quality and professionalism and high production values. If I like what I see, then I buy all rights and I will be buying more videos from you and eventually I will be paying you more per video. You get money, build your resume, and your name in the credits.
Use your ideas. If you run out of ideas, then I will supply you more ideas free and you still get paid.