Really any webcam from the last decade gets the job done. The trick is to add a filter to ignore everything that is not on the IR wavelength. Configuring camera and OpenTrack correctly is also vital. Like most webcams get really really slow when the scene is dark trying to raise gain and exposure. This must be disabled or their fps plummet into oblivion.

Find my scribbles on https://beko.famkos.net/2021/07/08/diy-headtracker-for-gaming-on-linux-pc/ (or watch the video) - whole thing did cost me 5 EUR. Mebbe it has some pointers for you too.