Dash cam in new car

Does it void the warranty if I get a dash cam hard wired?

Not sure what to do as, I have a brand new car and somebody already scratched my car which I'm looking at around €500 to repair.

I bought a dash cam but using usb connection to power it, so it doesn't switch on automatically and now I'm down in fixing the scratch.

So do I hard wire the dash cam and if this happens again, I'm hoping it will pick up a reg plate. But then, this can also void the warranty. So what do I do?