I have made a working face detection in Openhab using Frigate and CompreFace and the way to do it is published here
Unfortunately I was not able to use sendHttpPostRequest from Openhab nad I had to make a script to send the image for recognition to CompreFace.
I hope that Openhab guru’s will use this approach as a starting point and make the solution more elegant.
I am using to detect persons that are unknown, based on subject similarity value, if is lower than 95% the I consider that face as unknown and trigger a Telegram notification and if the Frigate recordings are off I turn them on for 10min.
Another use case (I am thinking to implement it) can be to set a room scene if a known person in detected in that room.