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How would a reverse video search engine work? You give it a clip and it shows you which longer clips it is in?

I would imagine it using a Shazam-like algorithm, only for downsampled video and not just the audio.

A decade ago there was some hobby implementations of these algorithms that got cease and desist letters form Shazam and that was all over HN.

https://m.youtube.com/watch?v=8Dj0rekeM7g

Yes, Exactly same as you described.

Could you take (embeddings of) frames from your query video and measure the pairwise similarity to frames from the reference videos, then rank by some summary function of that list of similarity scores?

What are the bottlenecks besides performance?

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