I get what you want, I mostly fail to see how NFTs help there either. If a digital camera is generating the SHA256 or whatever that even links to the video file (and this would only work for the RAW, not even compressed for transmission data), then it's a computer generating the data. I don't really see why you couldn't just have a computer generate a "fake camera" - it's not like you're going to be able to audit all the cameras a news org uses, and it'd be easy for someone to say they "lost" a camera, or it was stolen or whatever. And for the user submitted stuff from smartphones or their video cameras ... etc.
The problem with NFTs is always the link to the actual thing IMO. There's just no cryptographic way to link a physical item or anything that doesn't itself fit on the chain, nor is there a way to verify the original claims input that's outside the blockchain - i.e. it'll verify when the NFT was uploaded to the chain, but not when the video was taken. There's no obvious way for the blockchain to validate the GPS data provided (or not) by the camera that took the video etc.