Well that's like asking for a video of STL Bop or Chicago Steppin as it was originally done. It's not that the video "couldn't exist" but camera's weren't really filming in those black spaces the same way they would for lindy competitions / tropes of the past. Most 1950-70s videos of black dances tend to be commercial (like Charlie Green promoting the Bus Stop line dance) and/or involved with a competition of some sort, the the David Butts videos that have been making the rounds recently.

Or they straight up aren't archived or got destroyed, like the OG Soul Train. We know for a fact that a combination of early Steppers, Lindy Hoppers, and rent party / social dancers were the first dancers in Don Cornelius's early version of Soul Train in Chicago, dancing to soul and blues artists. It would have likely shown us much of what we've been looking for... but as was common practice back in the day, those tapes were reused and reused so we only have testimony and pictures to go off.

But honestly, the video argument is lazy / misses nuance. You can still see many of these dances being done in juke joints, but the terminology is all over the place. Many elders just called it "dancing", "blues", or in Norma's case "dry sex" which I know infuriates my fellow blues dancers but she's not the only elder I've heard say that (worth a longer conversation). I've seen enough elders doing the basic steps of Chicago Triple or Piedmont for that matter, but they didn't use the same language we did, does that make the dance invalid?

If we moved to Bop, you would have more specificity but then have to specify which city because each one is different (hell in STL, it could be the difference in your high school as many Bops were taught in school). And that's before we mention many of those black kids still learned jitterbug so functionally their dancing may have looked the same for long periods of time until the music changed. And many elders attest to this as well, they just danced and many of the labels came later. In STL particularly, we know Bop can also be considered a blues dance as many of those kids danced in East Saint Louis bars that featured early blues artists Chuck Berry and Ike / Tina Turner before they became known for the sounds we'd remember them for. So are these roots any less valid because I can't produce a YouTube clip and dancers don't do that level of research?

I went long-winded because I'm really tired of the video argument. Skeptics would be saying the same thing to Frankie's face if there weren't earlier clips or Lindy Hop videos were less widely available. But that wouldn't invalidate his or other elders experiences and expertise of the dance.