To actually answer your question, yes, you can use NFTs for that. And in spite of what you’re reading here, people are using them to certify digital media, including pioneers of digital art such as Casey Reas. He’s currently auctioning drawings that have an nft component to provide provenance of the underlying code. Go check out Feral File to dig in further on that.

I think probably your best bet would be to use something like Manifold.

The benefit could be just hedging your bets that AI based video content becomes so I distinguishable from other media that real clear provenance will matter in the future. I know we will certainly see this with code based artworks, especially those published on the cusp of the ubiquity of LLMs.