Wow, I just tried this out with a query that is answered by a video that I recently made. It showed not only my own video, but also several others I hadn't yet seen.
Previously, I had already tried using YouTube's searching tool to find videos for this, but didn't come up with much. Your tool returned several results I had not seen before, and they look super laser-targeted. REALLY impressive work! This is insanely cool, and FAR better than YouTube's search algorithm. Very very well done!
I'm interested in doing a similar YouTube indexing project (but indexing with pose detection rather than semantic segmentation) -- do you have any guidance for people wanting to do a similar project?