This video was taken at the Stone Tower in Allegheny State Park, New York State, by Floyd McKenzie. Because it was captured with a cell phone, the picture is highly pixelated, so I advise reducing the size of your video screen to make it more viewable. Toward the end of the video, you'll see a white, vaporous form that has the basic shape of a person. Then it seems to brighten or even come through the wall in the background although it doesn't change shape.
(Special thanks to Stacey Jones at Central New York Ghost Hunters)