Modern CCTV counting systems are able to provide the current number of people in a store, including the entering and leaving customers in real time. A limit for the number of people present in a facility can be set. Exceeding the maximum value generates an alarm, and a door lock for the entering customers can be activated. Integration of multiple cameras/inputs requires the use of Hikvision NVRs of I2 or I4 series, and – above 32 cameras – Hik-Central software.