As a licenced CCTV operator I can assure you that it nowhere near as easy to track someone on cameras as it appears to be on DCI Banks, Law & Order UK and so on. Most of it is down to luck, intuition and, dare I say it, stereotyping.
So few establishments these days are still using tape on a loop that hasn’t been changed in months and therefore is producing images of a very low quality. This is why you’ll often see images published in appeals that are quite frankly almost useless.