If I understand this correctly, you basically want to "act out" the cut scene in Unity, record the screen, and save it to play later as a real cut scene, correct?
If so, there's two ways you can do this:
###In Unity: Image Frame Campture###
Using an Update() function, every frame simply call CaptureScreenshot and save each file in order. Then, use video editing software to covert each still frame into a video. The quality of this will depend on your computer's processor and the complexity of the scene.
###External Video Capture###
Simply run your scene fullscreen, or at whatever resolution you would like your video to be, and capture it using an external game video recorder, such as [Fraps](http://www.fraps.com/) or [Camtasia](http://www.techsmith.com/camtasia.html).
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