help me please

[shayna-ilya]

Hi guys, i need help. I shoot a video from a webcam and by clicking on a button users enter their names and their descriptors are saved as json to disk. I save a few people this way and I need that when users come into view of the camera, their names are displayed. I do not understand how after I save descriptors to go through them in searching for the right user and if he is absent, deduce that he is not saved.