I don't like cod4 but i think i know what your getting at.
And sour_ the setting is called "kill camera" so to say it doesn't excist is slightly inaccurate whether it's different to cod4 or not i don't really care i asked the simple question of if it worked because i couldn't notice any difference in play after i died so i had no idea what it was.
When you die, your point of view turns and points in the direction the shot came from. It does not zoom in. It does not show a replay. It only points where the shot came from and nothing else. Personally I think it wrecks the game, as it takes away any attempt to snipe more than one shot or find a hidden location.