Its an impressive video. Though the sound effect heard when the UFO zips off (assuming its a sound of surprise made by the person filming) gives it away. The zero reaction-time is implausible.

The camera is obviously hand-held and zoomed to the max. So one would think there would be an accompanying jump in the steadiness of the camera to accommodate the zero-reaction time sound of surprise.

If the sound is the UFO's engine going into overdrive, or the sound of air resistance it makes by zipping through the air that quickly, its equally implausible because its miles away.

Plus, there's absolutely no attempt to follow the UFO with the camera when it zips away, as one intent on filming something one-of-a-kind and extraordinary would be expected to do.

With this feedback, people who fake UFO videos can hopefully addresses their inherent flaws in logic and produce videos that are 100% believable. Which means that all future completely believable UFO videos are certain to also be fakes.