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(1) Take a look display_image.cpp

(2) You can find a solution how to select a region by mouse clicks Take a look opencv_annotation.cpp ( you can find a sample modified code based on opencv_annotation.cpp here ) or another sample code here

(3) i think there is no built-in mosaic effect like you wanted, but it will be solved anyway

(4),(5),(6) you can solve them using waitKey and imwrite