Panic Alarm To Acitvate Camera And Notify Guards

We currently have a Hik OEM NVR system set up in a commercial building. The customer now wants to add about 10 panic alarms for various offices. I plan to use a Vista 128 panel with wireless hold up buttons. I would like integrate this in with the camera system which is monitored by guards on premises. I know I can trigger the cameras to go full screen with alarm inputs, but how can I differentiate what zone the panic alarm is in order to know which camera to trigger? I know I could use the bell out on the panel but that won't specify which zone.

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