This would be frustrating, surely, as a police officer, if your job involves reviewing CCTV at least semi-regularly you shouldn't be this naive?
Like you shouldn't need to be a Cambridge computer scientist to figure out that if you have say 48 hours of CCTV footage and you're trying to see a bike being stolen then you don't need to press play at the start and watch all 48 hours... you could likely find the bike being stolen within a few seconds if digital or minutes if tape. You don't need to know the exact time the incident happened, it makes almost no difference to the ability to review the tape and this would be super intuitive even to say a school kid using youtube and wanting to skip to where something specific happens.
Instead, the individual involved apparently won't listen to reason or apply any common sense and has gone with "compute says no".