1. A method comprising: providing a virtual-reality (VR) head-mounted display (V-HMD) having an imaging sensor, the imaging sensor including color-sensing pixels, and infrared (IR)-sensing pixels amongst the color-sensing pixels; capturing, using the imaging sensor, an image having a color portion and an IR portion; forming an IR image and a color image from the captured image by: forming the IR image from at least some of the IR portion from the captured image; forming the color image by replacing the IR portion of the captured image with color data determined from the color portion of the captured image and locations of the IR-sensing pixels in the imaging sensor; performing a first tracking based on the IR image; performing a second tracking based on the color image; and performing hand tracking based on the IR image and the color image.