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Just forget this one for anyone who needs to face verification. A kit is available, and it works with film and melodic elements. To install (change distro to kinetic if you need): sudo apt install ros-melodic-opencv-apps sudo apt install xterm sudo apt install ros-melodic-usb-cam Its based on these two opencv tutorials, so the code is commented and explained:

https://docs.opencv.org/3.3.1/db/d3a/facedetect_8cpp-example.html