Track event and direction when someone passed a doorway


We are working on new entertainment center, where we have to track our visitors: we have to know which doors they passed and in which direction (enter/exit). The visitors will wear smart bracelets.
We were going to use RFID portals here, however iBeacon looks more reasonable, as our smart bracelets will have LP Bluetooth anyway.
Can you, please, clarify, it this implementable using iBeacon (or similar) technology? The bracelets can be both: beacons or host devices, whatever is more convenient.

Kind regards,