A vehicular video camera display system includes an interior rearview mirror assembly having a mirror head accommodating an electrochromic reflective element, with a video display device disposed in the mirror head behind the electrochromic reflective element. With the interior rearview mirror assembly disposed at the in-cabin side of a windshield of a vehicle, a video display screen of the video display device is operable to display video images that are viewable through the electrochromic reflective element by a driver of the vehicle. Image data captured by a rearward-viewing video camera is communicated via a cable as a digital signal from the rearward-viewing video camera to control circuitry. The video display device displays video images that are derived, at least in part, from image data communicated from the rearward-viewing video camera to the control circuitry. The control circuitry controls display at the video display device of the video images.