The information about identified persons in subsequent frames is published via MQTT, if they are not detected in the last 'n' frames. Another MQTT client subscribed to the 'attendance' topic, will receive this information. On the reception side, the information is collated and inserted into a MySQL database that serves as the attendance register.
See the auto-generated entry register database on the MQTT reception side.
We can extend the system by pushing the data to the cloud or by building a front end to track or analyze the above data.