My initial thought was that it looked like a flashlight beam and moved like it as well. They also wondered if it could have been a bug, but they didn't find one on the inside of the lens cover. But it could have been on the outside of the cover, that would explain the blurriness of it.

I wonder if any other activity has ever been reported in that building. That would help build the case for it being paranormal.

They should check CPU monitors and copy apparatus inside the Credit Union. I believe that they will find that it is

a reflected light source from behind the bullet resistant glass to the right of the picture. Twelve layers of Polycarbonates

pressed tightly together and laminated to glass can do very funny things with light. Remember also that the building in question is more than likely covered by infra-red motion detectors as well. The surveillance cameras may be sensitive to a small amount of spectrum bleed according to their tuning. That coupled with the glass mentioned before and temperature changes in the building would make substantiating this video clip very difficult.

I could see saying it was a bug if happened only 1 time but happening more than one time pretty much rules that out. No way to verify paranormal but definitely strange.