You can buy cigarette lighter to usb converters for pennies
Poundland have done them in the past.
Most cars in the last 8 years ( well japanese and korean) have had USB as standard.
My Dashcam runs off just such a supply.
https://www.ebay.co.uk/itm/Dual-Port...gAAOSw~gRVqJ~v
Cheers
Mike T