Local Police Departments Personnel statistics from the Bureau of Justice Statistics
Statista - Quantitative data on over 80,000 topics from 18,000 sources. Has data on police force demographics, and more.
"Law Enforcement" section of the Characteristics of the Criminal Justice Systems in the Sourcebook of Criminal Justice Statistics
In the search box provided on each website, search for the specific type of surveillance equipment (ex., body cameras, in-car cameras, etc.) for which you would like statistics.