Your dashboard camera can record footages of events occurring when your car is parked with its engine off. The built-in battery will keep the sensor of your device in stand-by mode, and will start recording automatically for 30 seconds if it detects vibration or a shock. Parking mode can only record and save footage after an event has been detected by the sensor. 
IMPORTANT: Due to technical reasons, Parking mode is disabled by default. You can enable it in settings menu.