Run cables through ceiling into attic
Replace &quot;Pipe&quot; with &quot;Conduit&quot; and &quot;Fiberglass insulation&quot; with &quot;duct seal&quot; (note: the electrical conduit kind, not the air duct kind) and put a couple of bell-end fittings on the ends to make it nice (Or just ream the sharp corners off the inside of the cut ends really well to be inexpensive) and you have a normal workmanlike method of achieving your goal.
It will look more polished if the conduit extends all the way into the security camera box, rather than just poking through the ceiling above the box.