Download the Bink converter and you can play the videos in full screen, without CoD4.

Not only can you convert the video with Bink to a *.avi format, sound to *.wav (as you can hear on this page), but also...you can convert each frame in the videos into a *.jpg file.

Were do I find theese videos then??

C:\Program Files\Activision\Call of Duty 4 - Modern Warfare\main\video