By the 1999 NEC,there's an exception for CATV coaxial cables to have a clearance of 10 feet if they comply with Art. 820. If this is a security camera, it is CCTV, and doesn't comply, but I can't see that there would be a difference in the safety aspect. What do you think?
Realistically, the installer should have carried something larger than an 8' ladder.