With the emerging of AI technology, we no longer need to store images or tape in the server for processing demographics. The AI lens now is capable of processing demographic information such as age, gender, wearing glasses and converting it into a unique irreversible digitization code. Everyone is recognized by this code, meaning, no privacy violation on tracing the identity back to an individual. 

Given the ability to trace the digitization code of a person, we can perform analysis on footfall, return customer, duration of time spent in the shopping mall or even on a certain floor or shop.