The video was shot on a phone at a distance. The blown up images are blurry but that is normal in such an instance. The supposed UFO is quite blurry and that is typical of many of the images of these types of aerial phenomenon. This is attributed to disturbance of the air around the phenomenon. This may be caused by some type of unknown propulsion utilized by these phenomenon (I am not saying they are craft). These phenomenon are real but we don’t fully understand what or whom they are or how they actually work.
There is always this theory.