made a head track out of a old phone charging cable, 3 infared leds (100 cost me £6.50 on amazon) and a 22ohm resistor (£2 for 10) wired 3 lights in series onto my razer headphones, one just above each ear piece and one at the top, I used a cable tie to make an arm for the one on top and taped it up for astetics. Download opentrack 2.0 and play around with filters on webcam and job done