System information (version)

• OpenCV => 3.4.x, 4.x (master)
• Operating System / Platform => all
• Compiler => n/a

Detailed description

As a step towards even more clean OpenCV w.r.t. possible licensing issues, we need to remove/substitute functionality that is not completely clean and/or incompatible with OpenCV license.

Nowadays, deep nets let us to detect faces, facial features and body parts very reliably and quite efficiently. So, it's time to remove haarcascade_mcs_*.xml files, donated by Modesto Castrillón Santana several years ago. The files are free just for non-commercial use, and this is a restriction that we do not quite accept nowadays.