There is also the PixLab API which let you automatically apply a blur filter for each detected face or any other target regions you want using only two Rest API endpoints.

Python: https://gist.github.com/symisc/6ecdea76ba0d33d73ea7f23cade0d...

PHP: https://gist.github.com/symisc/d54808915093e5375fdcb841e4365...

Docs: https://pixlab.io/cmdls