reverse image search - but for youtube?

Is it possible to do a reverse image search ... but on youtube videos?  

I do a lot of reverse image searching.  I have never found a reverse image search that reaches into videos, on YouTube or elsewhere.  I would be super-happy to learn of one that I currently don't know about.

I've had extremely minor luck (which is to say, a few searches have worked, out of dozens) by grabbing a still frame from a video and doing reverse image searches on that.  But I can't say I ever got Youtube results.

Here is my "secret weapon" for reverse image searches: a single one-page internet site that lists every reverse image search tool in existence (and a bunch of other handy image-handling and image-investigation tools):  ImgOps

Extracting still frames is a solid approach. I have had better luck with face-specific searches, and my ProFaceFinder review highlights its ability to trace a face acrossYouTube thumbnails or static clips, which is useful for spotting unauthorized use of personal videos. It works well enough for my occasional checks on a gardener's channel.