I have just talked with a partner about a funny case of using facial recognition. His customer, a branch office of a corporation, has requested him to add facial recognition for the identification over the watch list on the entrance cameras. Their watch list is not large because it includes only their headquarters management team. And as soon as somebody from the management enters the building the respective people are notified. They were so pissed off by the secrete visits from the headquarters that they have paid for the system with their own money.
I know about other similar case where the notification was from the access control system in case the presented credential (card) was on the hidden watch list.
Did you have similar requests from your customers?