So I would not just kludge in a couple of wires to my obd port. If your cigarette lighter is only powered when the engine is on you can use either of a couple of obd power supplies on Amazon and with a similar switch and they are very inexpensive. The easiest to find m to f adapter with the switch built in is made by Koolatron (it's called a "battery saver" and available on amazon). This rig will kill power to your dashcam if your battery drops below 11.6 volts. If you cigarette lighter is always on, you can put in a male to female lighter adapter with a low voltage cutoff switch and then a cigarette lighter to usb adapter to your dashcam. This is an actual electronics project tho. This way it doesn't drain the battery to death but it still runs for some period of time after you remove the key (during an accident for example). If you're trying to run the camera after the ignition is turned off, you might want to wire up something like a turbo timer- ie, a power supply directly connected to the battery that listens on a switched power line and then waits a configurable period of time before turning off the circuit. If you're trying to install something on the ceiling near the rear view mirror, I find there is plenty of hollow space in the pillar around the windshield (makes pillar mount gauges with lots of wires very easy, certainly enough room to run power for a camera). If you just want the thing to run off car power and turn on and off with the ignition, you should splice into a switched power line under the dash- if there's nothing conveniently close to your install location, you can always just directly splice it in under the steering column and run a wire under the dash to wherever you need it. You could splice in behind the port if you know which wire is switched 12V though. No, that's bad because it blocks off the OBD2 port and the wire could get knocked out. So except for the fact that you will/could drain the battery, connecting a dash cam to the ODB II port should not give any problems.
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