Elevator People Count

I'm wondering if this is do-able (and if so, any systems in particular?):

Access control in the elevator in an office building, meaning I need to read to get to my floor. ACS counts the reads - there should be 7 people in the elevator as it leaves the parkade. CCTV/VMS in the elevator counts people. There are 9 in the elevator. Could be an intruder, could be tail gating. An alarm goes out through VMS or ACS to concierge, or other monitor.

I'm guessing someone could custom write this, just wondering if it exists out of the box, more or less. Thanks.

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