This script saves a sequence of images when you hit play. Framerate will run at a constant rate (And game time adjusted). When complete you can import the image sequence into quicktime pro to create a movie out of it.
Name it "ScreenShotMovie".
Attach it to the camera you wish to record from.
Adjust settings to your liking.
Hit play and it should dump out image files. They will be in your project's root folder, so they will not appear in the Unity Editor.