Gesture recognition discussed in this tech note from Maxim Integrated. Link here (PDF)
Infotainment gesture control enhances driver experience and safety by helping avoid distractions caused by fiddling with touchscreens and poorly located dials. Gesture recognition can complement touchscreens, voice, and knobs so that the driver can focus on the road. Time-of flight cameras, although fancy, are computationally heavy and expensive. A new, disruptive approach integrates the use of optics, sensing, and an analog front-end in a single ASIC, dramatically reducing cost and advancing the adoption of this important technology in a wider tier of automobiles.