Power Solutions
With Power Solutions, you could enable the Parking Mode for BlackVue dashcams. You have the option by tapping the power from your car battery using the hardwiring kit, Power Magic Pro.
Another safer option is to use a standalone rechargeable battery pack which is Cellink battery. Cellink is charged during driving and when you are away (engine is off), your dashcam is powered by the Cellink safely till it depletes.