Craig Mc Cluskey beat me to the coiled ground conductor shown in the picture! Craig's comment was excellent.
Concerning depth of the ground rod, in the US, the National Electrical Code book section 250.53(G) requires a ground rod installed such that at least 8 feet of length is in contact with the soil, and driven to a depth of not less than 8 feet. Also, the upper end of the rod shall be flush with or below ground level (for protection) unless the above-ground end and conductor attachment are protected from physical damage (such as enclosed in metal, wood, or equivalent protective covering per section 250.10).
Outside the US, it's probably best if the installer check with the local authority having jurisdiction for specific grounding requirements.
The article was a good primer to pole mounted cameras, thanks Brian!
In a follow up article, it would be very helpful if you could include photos of actual camera installs on round metal poles, timber poles, and even on metal poles with light fixtures attached.