First few frames of the video show Aug 28, 2008 and the youtube date is April 28th 2009. It looks pretty genuine to me, but as far as what it is, I
have no idea.
That sounds like Jaime Maussan talking. He keeps saying it doesn't look like a balloon, but It could very well be. There are many different types
of balloons and many of those have some of the same characteristics as seen in the video.
Either way it is still a great video, thanks for posting it.