It is called fraps, you can find it here: http://www.fraps.com/
Give it a try, it can be activated ingame by pressing F9. (previously execute it before running crysis 2)
Now, everytime i get killed suspiciously i press F9, record the kill, F9 again and when replay its over, then post aftergaming. movies are saved in a default folder, u may change it as you like.
Cheers