I have a blackvue dashcam in my ZT-T which is wired in at permanent live.
I've fitted the 12V control box which will shut down the power supply when the voltage drops below a certain value, which you can determine with dipswitched inside the control box. I can't exactly remember which setting I used, but I've set it on the safe side (I think the highest voltage setting if I remember correctly).
The dashcam records pretty much everything moving in front of the car, so when you're parked on a carpark or even with the front pointing towards a tree, it'll pretty much record 24/7! In my experience it's a pretty useless function since I've tried to use the lowest sensibility setting for the camera, but even then it keeps recording leaves and branches moving by the wind!
The control box does switch off the camera after a while depending on how much movement there's been, most of the time after 2 hours or so, so you'll most likely end up with an SD card filled with people walking or cars driving past, or lots of tree-footage
