Finally installed dashcam properly.

Bought simple 12V car adapter with wires, got specific pin for fuse box, put that construction into inner part of front panel, fixed with some wire and duct tape. Doesn't look good but works ok.

At least now there are no visible wires that ruin the view, and original 12V socket is free for something else. Still don't get why manufacturers don't put multiple usbs everywhere in 21st century.