Ok, so I was surfing the web, and I found some interesting thing: make videos where it looks like a character of cod 4 is moving in a real place. Maybe you've seen the opposite: people adding themselves in the game environment by recording themselves move with a real green screen in the background. But this is different. To accomplish this, you need to get into a map that has been modified to show that bright green all around the character. The map may have some tiny markers just to make it possible to know how the charater will move (jumping, crouching, climbing...) Just like this one:
After you use a video editing program with chroma key effects, you can mix the green screen video, and some real life video, or actually, any kind of video or background you like. This next video is an example, but it's using Crysis because I didn't find any cod 4 examples:
This could be awsome for signatures and such, or just as a video in itself.
Everything is good except I don't know where to find the green screen map. And I'm pretty sure it would be easy to make if needed, however, I'm afraid I'm too lazy to do that, I have no mapping experience. But I promise that if someone goes and makes me such a map, I'll make a video and share it with you guys. WarBreed knows I deliver, so I'm challenging you to put me to the test.