Rendering, are kill cams possible?

[cheiftiger]

I'm just curious if it's even possible to have kill-cams in Gmod, because from my thinking this is what you would have to do:

1. Create a render target at each client's view and record it somehow.
2. When you are killed, somehow play the last 5 seconds of that client's view.

I have no idea how to go about saving and replaying render targets, I just know that to be the only way as of now.

Anyone else have any ideas on how this would be possible (if at all)?