This could be a reflection on the cockpit window, but given that the pilot noticed it and quickly turned his camera on it, that seems unlikely. From his point of view, a reflection would have been obvious. Too bad he had such a low resolution camera! It’s unlikely, also, to be a hoax video, so it’s a probable unknown.
Thanks to UFOBlogger.comhttp://www.youtube.com/watch?v=AJ6Wn0pg2WU