How to implement a sharp attenuation of the screen?

Question

Lua

Hello everyone, I'm probably off topic here, but I have nowhere else to ask (although probably still on the topic because Garrys Mod uses Lua actively)

In general, there used to be a mod that added the death effect from The last of us, but this mod was deleted, and I thought about making it myself.

And now my question is how can I realize that if the player dies, then the camera is fixed in place from a third person (but it monitors the ragdoll where it flies (as the camera in football watches the ball)) then after a second the screen abruptly goes out together with a sound effect, and the sound in the game was muted so that it seems like you can hear it behind the wall.

Thanks in advance (if it’s still off topic, then I’m sorry, it’s just that there’s really nowhere to look for the answer)