In order to have a facial recognition software rapidly usable, I used an API from Amazon Web Service. I wanted a single web page that would allow me to grab a photo and perform some basic recognition algorithms on the photo.
Amazon released their own image recognition engine (Amazon Rekognition service) on their platform. This allows me to create one or more collections. A collection is a data base of facial vectors for sample photos. Once you have a collection on Amazon, you can then take a subject photo and have it compare the features to its reference collection, and return the closest match.
Furthermore, you can store your data freely on the amazon server.
All the instructions you need to download the libraries and use the API are detailed at the following link:
NOTE: I had some problem installing all the ruby's library with "bundle install". I needed to install all library one by one threw my teminal..