and that would be a problem, because........... ? 
As my face isn't on a list of 'wanted' murderers, child abusers, or other known criminals, then I wouldn't have an issue with anything that assists with tracking those who are. In fact, it sounds like a positive to me.
My face will be on CCTV every day as I walk down the High Street , into shops, banks, schools, Nurseries, get on and off buses, etc etc etc.
Improved technology that can then use those images that are captured throughout the day to track the country's 'most wanted' sounds like a good move to me.