What you're looking at is an LED and a reflector. The camera is right next to it behind the black glass rectangle. This black glass rectangle is a piece of liq

What you're looking at is an LED and a reflector. The camera is right next to it behind the black glass rectangle. This black glass rectangle is a piece of liquid crystal glass and it stays opaque when the camera is not in use. It turns transparent only when they want to allow filming. And the rotating button on the top of the device mechanically controls the direction of the camera. Switch it to 'off' and the camera will not face the interior of the car. Also, the hackathon screenshots are just quick mock-ups. The developers didn't have access to a working prototype to make them. (Source : I was at this hackathon).