A much better architecture is to run higher-voltage (say 12, or 16, or 24VDC) over the long cable runs, then down-convert to 5VDC at/near the camera. This approach allows use of smaller wire, will incur less voltage drop (since the current is lower), and reduces the potential for EMI pickup on the long cables.
If you search this forum, you’ll find numerous articles on using dashcam power kits (and other methods) to down-convert to 5VDC.