Freaky. Reminds me of a shadow person video from the same era where the shadow runs around a table in a kitchen in broad daylight and vanishes behind a woman. Probably fake but interesting.
What a dumb answer from someone who doesn't know what they are talking about...
Looks like a bug on the camera lens to me. crawls out of the center after the kid runs by. I can see some parents filming their kid running around, not noticing the bug, and then when watching it later they notice it, and put it on youtube, thinking its a demon.