For the moment, I'm afraid that it's not possible at all.
You can request movies that are missing from our database of movies, but you can't request videos that are missing from our database of existing videos.
Probably in the future we'll allow the users to contribute missing videos. Unfortunately, right now we don't have the human resource to manage this kind of feature.
Don't forget that you can still add a video that you own, even if it's missing from our database of existing videos. Simply you'll have to adjust all the fields manually.