This is pretty easy, just take a look at the killcam.gsc in the mw2 patch look how it works. All you have to do is excute the playback to everyplayer in the game, than just that certain one.
i've tried & so far i've managed to get a killcam for everyone when game ends.. too bad it's your own last death it shows :p
but i've not looked into mw2 code yet, so i might do that