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Had the same idea a few years back. You don't need blockchain though, good old fashioned CAs will work. Use standard digital signatures on the keyframe data but that does necessitate a new video format standard. Good luck with that. You could probably DIY by overlaying a QR code signature on the video keyframe as a stopgap until an official format exists.

Maybe this is the application NFTs (with some tweaks) have been looking for.

Someone will figure out how to crack it though, or the possibility will be plausible enough, and then we'll be at zero again.

So blockchain is not even needed,the main idea still stands though.

Why would they need a blockchain for that? In either case you’d have to trust the company that their inputs, which are external to the network itself, are authentic.

So point the camera at a screen?