The more unprofessional they appear to be, the greater the likelihood that they are real. (I saw some shown in a courtroom, one time, in my capacity as a law enforcement officer.)
I would avoid watching any such video, unless it was done by a major motion picture studio.
When the movie Cannibal Holocaust came out, it was believed that it was really a snuff film and the director had killed all the actors. He actually had them sign a contract to not appear in any films or commercials for a year after the movie was released to make it seem even more real. This backfired on him and was arrested for the murder of the actors and had to get them all to appear and void the contracts to avoid life in prison.