Hou I can add a face recognition in my rails app ?

I have one app where i have a scaffold with a register of peoples with photo, but for me search if the people have your datas registered in my system i need use face recognition for read face in web camera and read the photos of database and if search the people return your personal datas, how i can make this in rails ??? Im begginer with rails.
I need to implement this as soon as possible in my system, but I couldn't find anything on the internet very specific.