UFOs in the 2012 Olympic inauguration? Or a goodyear blimp?

 On the internet, some have published videos wth a supposed UFO seen in the Olympics opening:

However, I think this object is likely to be a Goodyear's blimp, as seen in this video:

If not a blimp, the object in these videos is too ambiguous as to make any warranted conclusions about its nature (let alone, about its origin).