root/samples/cpp/tutorial_code/

[..]
  1. HighGUI/
  2. Histograms_Matching/
  3. ImgProc/
  4. ImgTrans/
  5. ShapeDescriptors/
  6. TrackingMotion/
  7. calib3d/
  8. core/
  9. features2D/
  10. gpu/
  11. introduction/
  12. ml/
  13. objectDetection/
  14. photo/
  15. video/
  16. viz/
  17. xfeatures2D/
[..]