Features:
1. It's written in ZScript (main difference between The Zombie Killer's Accurate Chasecam and this mod).
2. It attempts to re-create GZDoom's builtin chasecam.
3. Code-wise, it is ran by an inventory.
Bugs:
1. For some reason the camera lags behind on movement when the player strafes.
Download file in attachment. Tested with GZDoom 3.7.2.
Screenshots:
Spoiler: