Footage of Dobby the house-elf from Harry Potter caught on home security cam video

Vivian Gomez posted the above home security cam video to her Facebook page. She writes:

"So I woke up Sunday morning and saw this on my camera and am trying to figure out...what the heck?? First I saw the shadow walking from my front door then I saw this thing....has anyone else seen this on their cameras?? The other two cameras didn’t pick it up for some reason."

Internet commenters insist that the mysterious creature is Dobby the house-elf from Harry Potter, but following Occam's razor, the simplest explanation is that it is an extraterrestrial.