it might be possible to create an app that uploads video directly to a blockchain, and that proves that it's live. maybe the app could run on the blockchain too.
I read on Peg a video timeline to the blockchain
that the block-time on old blockchains was too long, but with a 12 second blocktime on ethereum...
it would be awesome to be able to prove an event took Place. the quality doesn't have to be perfect, it just needs to be sufficient enough for proof