(moderator edit)To clarify the IR trackers emit infrared energy in the form of a heat signature that measures the energy of the object. I'm not 100% sure of all the internal workings of the technology on how they calibrate it, but I assume that it's calibrated much like the Tobii Eye Tracker on gaming laptops to where the emphasis are on the eyes.
So-called IR trackers are cameras with the image sensors sensitivity extended into the infrared spectrum. The advantage of this is that it permits the car to shine light in your face without blinding you, since our eyes are not sensitive to the illuminator's wavelength. If the camera was not sensitive to the infrared spectrum, then it would need to be more sensitive to low ambient light, making the eye tracking more difficult.
The car certainly will have image processing that is optimized for eye detection and tracking, as the stated function of the camera is to assure attentiveness of the driver. But, taking the conspiratorial attitude that seems to resonate with you, I can say that unless the image data is physically separated completely from the rest of the car's data processor (a VERY unlikely possibility), then that image data is available for any number of potential (mis)uses, regardless of what GM may say. Maybe without GM's knowledge.
The same applies to Tesla, of course, and any other manufacturer that has a driver monitoring camera.
Oh, and there's a microphone built into your Tesla. That might be more of a concern than someone watching you pick your nose.
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