As already stated, I believe it’s someone wearing a Ghillie Suit.
If the hoaxer wearing the suit is not known to those filming then I'd say he's an idiot.
Only recently we've had a teenager shooting a creature (that he thought was a chupacabra - I think it’s a mangy dog myself). If someone wants to
run around hoaxing people then the day will come when these hoaxers find a small lead pill inserted between their eyes by an overzealous, trigger
happy loon.