The technical starting position
On larger terrains, the cost may be limited by distance and sensitivity to environmental influences. A wireless bridge may be possible, but it may not always provide the desired security.
Fiber optic is interesting when a camera connection needs to reach a long distance or when electrical separation between buildings is desired.

On larger terrains, the cost may be limited by distance and sensitivity to environmental influences. A wireless bridge may be possible, but it may not always provide the desired security.
Determine distance, route, required image bandwidth, existing mantel tube, and locations for active equipment on both sides. Take into account professional installation and management.
Choose fiber optic as the route, as scalability and reliability justify it. Plan appropriate network equipment and local PoE on both sides for the cameras.
Measure or test the connection, check NVR recording and record fiber route and used equipment. Test repair after re-powering both ends.
No. The camera needs local appropriate power or a PoE switch.
No, but the construction must justify the situation and costs.