> Do the math sometime on what kind of bandwidth and storage capacity a large agency like NYPD

40,000 officers (rounded up)

8 hours of full HD video can be stored in 10 gigs of storage

do this 365 days a year for every officer

S3 standard costs less than 3 cents per gigabyte to store per month

result: about 50 million dollars to store 8 hours of FHD video of every officer every day for a year

The NYPD anual budget is 5 billion dollars. Thus, storing all this video would cost about 1% of the budget. I've made generous roundings in favor of overestimating this cost, and in reality it would be much less.