You are right they did add a camera system in the end of last year, but it's optical cameras, not infrared.BMW uses it for their L2 system. Its called Extended Traffic Jam Assistant.
Upcoming cars that will use it for their L2 within/around a year from now are Lucid, Mercedes, Volvo, Ford's Mach-E.
BMW's Extended Traffic Jam Assistant System wants to stare into your eyes
I'm aware that there are a bunch of relatively expensive cars coming out that will have them, but that's still very far from saying "most modern cars" have it.