The reasons given for the video being fake aren't convincing. There's room between the coffin and the people standing behind it for people to walk through, and the rope barrier doesn't extend all the way back to prevent them from entering. As for where the people came from, the camera angle doesn't include the entire room so they could have come from off camera. Also, something that moves transversely to a camera that doesn't tilt to follow it always appears blurred in a single frame.
It's worth pointing out these erroneous allegations of fakeness because there really are some fakes out there and we don't want the waters muddied by cranks. A certainly fake video is the one of the alleged New Zealand Christchurch mosque shooting, the video the government made it a crime to distribute.