My circa 2016 DIY attempt at an equivalent of TrackIR used a piece of floppy disk media as IR filter for a PS3eye camera (I used 850nm LEDs tho) .

More current howto linked to filters at aliexpress, and they have all sorts of ir filters in 940nm, for things that look like the super cheap IR backup cameras. Maybe a dirt cheap backup camera housing+filter could work…

Also, that old wiimote might have new purpose. Look at step 7 here.