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The only thing I can suggest is a trip to the psych ward. No, I'm kidding. Who knows what you're seeing, since the U in UFO simply means unidentified.
Joking aside, Adobe After Effects has a tracking function for following a subject on screen. Other NLEs probably have a similar function, but I have used it in After Effects. Do a Google search on this, and you should be able to find instructions on how to do it. One caveat, however: Keep in mind that, depending on the method used for tracking, it can diminish the quality of your video. You may have to experiment a little.