I think the question is what is the representation you need to be able to index and lookup facial data. I feel like last time I did a review of the SOTA i didn't find any easy open source implementations but this actually looks promising https://github.com/serengil/deepface

I have this weird idea where everyone seems ok with the government and corporations having these capabilities so we should implement stuff to make public indexes of faces so EVERYONE has the capability then people might care. Like if i setup my own flock cameras and started publishing licence plate data i feel like there may be some objections. We should just make an open source flock that people can put on their own land that makes all the data public (or however the person wants) https://github.com/openalpr/openalpr