I think you'll need a screen recorder for that
No, no. Forget fraps and such, that only records what you see at the moment. I'm talking about recording everything that is happening, and then make it possible to replay it and giving you free control of the camera.
Let's say you walk in a dark alley somewhere in Skyrim. You are ambushed by two thugs, but you manage to "neutralize" them both in a hefty fight. After the combat is over you think 'hmmm that was a wicked fight, I wonder how it would look from a different perspective' and you jump into the in-game replay moviemaker to watch the scene unfold from a cinematic view.