Roman2K, great idea to ponder about! Keep the ideas coming.
However, the current poll system does not seem very suitable for this idea. The video content would grow dynamically, but the current polls only support static and only up to 10 options. I also don't think the poll options can link to external content.
It seems much easier to just rate each uploaded video individually. A top 10 list could then automatically be created for each section (knuckles, knee, spine, etc.) or an overall top 10 for all videos. Very similar to how youtube.com works today.
If we use youtube.com for this, we could upload in group "People" and create a tag like "jointcrackers.com". If everyone used the same tag like this, I guess you can get at least a top rating for all clips in this category.
But maybe we could even host the videos here? As recently announced I'm currently in the planing stages to haul this site over to a much superior CMS system. Dupral also supports video content. Endless possibilities.