The reality is that we're past the point where videos constitute useful evidence unless you can strongly demonstrate the integrity of the source against manipulation. You have to have a credible witness say "I taped this" or a security camera you are extremely confident has not been breached, etc.
Video on its own is not sufficient with where the technology is. You might be able to point to most outputs of public tools and find artifacts, but it's close enough that pixel perfect fakes are entirely plausible, especially for lower resolution/compressed videos.