That is peculiar. These types of unidentified objects seldom get an explanation. I've seen a few videos similar to this before which might be explained by mere space debree, although this looks like went from a stationery position. The logical side of me wants to say camera angle, that debree was always moving but only appears so when it changes direction enough to be noticeable, add on top of this a fish eye lens. Or...Aliens 😳