Car failed to give way as you can quite clearly see the sign from the camera car that states it has priority over oncoming traffic. The other driver must therefore have driven past a sign and double broken road lines which requires them to give way to oncoming traffic.
Two wrongs don't make a right.. The dashcam car appears to be tail-gating and when they exit the roundabout they are too close to the person in front; they themselves are being a bit of an idiot.
What a prick