ok its a vid of a ghost head, the man is walking and looking at a building and stumbles upon a possible ghost head, then the possible ghost leave, this vid gave a chill down my spine!

It's creepy, thats for certain.

To tell you the truth, I really can't tell because of the video quality. Perhaps someone else might have some fact to point out about the vid.

Look at the comments below the video. I noticed the contrast change, too, and when you go frame by frame you see some editing done. Someone's shoulder shows on the edge of the building at about the 5 second mark.

If it was done in one take, then (as others suggested) they ducked behind the camera. I think it's a reasonably good edit job.