About CCTV (closed-circuit television) is also called static video surveillance. Here is my educated belief, most video surveillance is useless. As a police Intelligence Manager I was given thousands of crimes captured on video surveillance or CCTV in digital or analogue, from a multitude of sources. People and some police expected me to be able to zoom in from hundreds of feet and get a photo of the offender or the registration number of a vehicle or to enhance a grainy or dark image. I learned how to get the best out of every image; however, it cannot be done adequately with average equipment. It relies on the video surveillance system that you have installed and on the equipment available to Police.
The secret to most video surveillance is the positioning of the cameras and your ongoing timely maintenance. Dust build up is a killer on cameras. Perhaps you have a new business, factory or home or want to update an old system. You have a skilled technician install cameras and a hard disk on your premises or integrated 'cloud' storage. You have paid a significant amount for a system that is clear and looks nice on your surveillance monitor. In my experience those techs often use the same locations as the previous premises they worked on, but yours needs to be site specific. What about blind spots, the distance from the camera to the point of the crime, a facial image camera? Far more important than just having a video of a crime, which is nice to look at, it the evidentiary value that is so important. You want images of their faces, their clothing, and their vehicle up close to help the investigator. So much can be done with one clear image.
Of all the crime surveillance videos brought to me, less than 5% were useful. Many systems were good, but had little forethought when installed, then were not maintained. You can back it in; the camera that has been out for weeks is the one that would have captured the incident. Coincidental or planned is the question in some of these crimes, if staff are involved in causing the incident they may be aware that the camera was out and that you do not usually take immediate action to have your system repaired.
I offer to help make your video surveillance the best it can be on your budget, I will tell you where to place cameras for crime prevention or to capture crimes, workplace accidents or public liability concerns. It might assist in complaints against staff by other staff or people at your premises. In a nutshell it might save a whole lot of heartache.