Instructions
Start "COD: WAW" and let it load to the main menu.
Click "Options" and find the check box marked "Enable Console."
Click this check box and save your options. From here, enter a multiplayer lobby or single-player mission.
Open the console by hitting the tilde key. Type "/record myvideo," where "myvideo" represents whatever filename you wish to use.
Open the console again and type "/stoprecord" to finish the video capture.
Find your video in the "Call of Duty" folder, usually located somewhere like "C:\Program Files\Call of Duty."