I currently use a DR32 dashcam. When it's recording, it blinks the same red dot on screen like in the video here. As well as it shows a constant red TINY light that stays on to let you know it's recording if you have the screen auto shut off. If you take out the memory card, the TINY red light will blink IIRC, and the screen will stay on displaying a missing memory card.
For the A119, it would be nice to replace the green led's and change them to Red. With brightness control. Constant red while recording, blinking red when it's not recording. This way, if it's blinking and recording it will be bothersome while driving. Also, an option to just turn it off would be optional if one sees fit. The smaller the red led, the better. That way it's not noticeable in your vision while driving, and only if you look directly at it. The green light in the video looked big and too much.
Looking back at the video. I'd say to remove the led out of the left button, and keep it in the center button but change to red. Recording-constant red. Not recording-blinking. Also a timer for the screen to auto shut off but I'd assume all dashcams turn off automatically after a certain time. Green will be annoying. Red is easier on the eyes and especially in your peripheral vision.