Ghost, if you ask me... It looks like something disc-shaped is falling, turning over as it falls... Picture a coin flipped in the air, how it turns over... It moves at a fairly consistent speed, and only seems to "pulse" when it moves into the center of the IR vision, which lends me to believe it's something falling... Perhaps a chip of paint or something similar.
Isn't this in the basement of the house? If so, there's a lot of stuff that could fall.
Just my thoughts.