What you are wanting to do can probably be done. From vBulletin, considering that it does not have an encrypted source, you can modify vBulletin to also register the person in vShare. People could then link to their profiles that they have in your vShare site, which would list any videos that they have uploaded. People can rate the videos on vShare and, in turn, can give reputation points in vBulletin for that particular user.

The biggest problem that you are going to run into with vShare (as it exists today) is that the source code is encrypted and cannot be modified. This limits what all you can add into or modify in vShare. The next version of vShare is supposed to be open source, which will allow for an unlimited amount of modifications and add-ons for it.