I'm trying to make the red stain from dead by daylight

I’m trying to make the red stain from dead by daylight, for those of you who don’t know what it is, it’s a simple concept. Its a red light in front of the player to indicate where they’re looking, and indicates their fov. You could say just put a red part in front of the player, but i don’t want it go through walls. Any suggestions?

Transparent part that changes with their FOV, also a red highlight with alwaysontop off.