I hope anyone who needs to has already figured this out, but the whole shebang (from NBC's point of view) is available at their site (and YouTube): clicky. The event itself starts at about 15 mins. in.
They also have it broken up into segments, but I don't know if the segments cover the whole thing. page of opening ceremonies videos.
It would be cool to see the BBC take on it. Might have to borrow my son's laptop that has ExpatShield loaded.