It's not just the UFO that's fake in this video - it's the car and the sky and the camera shake. In other words, the whole video is CGI. Even the pinging of the "Driver's Door Open" warning
It's really, really hard to create a GGI human face that's convincing. If you know this, then you also know the reason why so many blockbuster movies (Antz, Bug's life, Cars, WALL•E etc) have been about things and not humans
In the final installment of Peter Jackson’s video blog, the director introduces The Hobbit’s post crew, while the team scrambles to complete the film.
Will we ever have completely digital actors intermingling with real ones? Will we soon have feature films where dead actors are brought back to life through the miracle of CGI and motion capture? Will computer generated images of humans ever be so good that we can't distinguish them from the real thing in any way?