The image of a semi-translucent blob appears and disappears throughout the security footage

No, it was not really stealing wine bottles. The report is that a security guard that was being blamed for stealing some of the alcohol supplies decided to install a camera in order to catch the real thief and clear his name.
What he believes to have captured is a ghost instead.

I want to say it’s another “bug on the lens” ghost video, but the way is disappears and reappears is quite strange. Do any of you guys have any idea of a possible logical explanation?