Detecting & Monitoring Valid Physical Entry In Access Control Systems

What is the best way of detecting & monitoring valid physical entry in access control systems where people need to be counted as they pass across the doors on valid every only.

For example if a valid token is presented and the door opened but the person doesn't actually pass through if for example they forgot something and turned etc, for counting systems this can result in an in-accurate count.

I think perhaps mounting beams across the door (on the other side) to detect physical interruption may be the answer?

How can this be installed & configured in an access control system when a valid every is already being configured as a valid token & door contact combined to create a valid entry, how can the additional beam be added onto this scenario?

Also, if anyone has experience in how to integrate this solution in an Avigilon ACM system then that would be great.

Many thanks.

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