It's a HOAX. It's pure CGI.
You can see it's not even a real video. They used a common technique where they take a single image (in this case a low quality compressed image) and added fake camera movements, and fake zoom, and fake noise / grain to make it appear like a video. It makes it easier to add a fake UFO animation to it, so they can avoid having to do any motion tracking / match moving.
We can tell it is a fake video made from a single image (low quality compressed image) because you can see gradient banding (caused by compression) in the sky, and the gradient banding is moving with the foreground / background fixed in the sky. This means the image of the sky was compressed first, then it was made into a compressed video.
If this was a real video, the gradient banding wouldn't move with the foreground / background. Video compression would have caused the gradient to form, and the gradient would not be fixed in place, it would move around constantly as the video's images / frame changed. But in this case, the gradient was already formed by image compression first, then it was compressed into a video. So the banding is fixed in the sky.
So it is a confirmed HOAX..
www.abovetopsecret.com/forum/thread1049285/pg12#pid18846822
There is another video with a similar event. In this case you can obviously see fake camera movements, and also the YouTube user / channel has a history of 'liking" many "Adobe After Effects" videos and tutorials in specific effects.
www.abovetopsecret.com/forum/thread1049285/pg10#pid18845190
Adding HOAX to the title and will move to the HOAX forum later./QUOTE]