A video? Just claim it’s CGI.
That is the point. Evidence has to be established and supported by other evidence to be a valid demonstration. Otherwise, clips from Hellboy are as much evidence of demons as anything Vatican videographers may or may not have come up with. The Omen movie series might be evidence of demons. And that Sam Neil seemed so trusting with his career as a paleontologist too.
If a bank robber is on trial and they show him or her surveillance footage of the robber and you can see his or her face, you have the accused sitting right there to compare the video with. There are probably customers and bank employees in the video that are watching it while attending the trial. They've been interviewed beforehand and given statements and may well give testimony at the trial. You have witnesses, firearms, fingerprints, dye packets and other evidence to support it.
Demons? Nothing like that so far. Not even the video. Just claims of videos and claims of the knowledge of demon names.
I still think it was Bobbie.