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This is my code

      #include <opencv2/core/core.hpp>
      #include <opencv2/highgui/highgui.hpp>

      using namespace std;
      using namespace cv;

      Mat image;
      char click;
      Point p1;
      Point p2;
      static void onMouse(int event, int x, int y, int, void*)
      {

switch (event)
{
case CV_EVENT_LBUTTONDOWN:
        if (click == 0){ // first click  top left
    click = 1;
    printf("%d %d", x, y);

    }
    else {          // second click  bottom right
    click = 2;
    printf("%d %d", x, y);
    }

    break;
case CV_EVENT_LBUTTONUP:
    break;
  }


      }

      void blurImage() {
      // compute the block



  int Num_cols = (p2.x - p1.x) / block;


      int Num_row = (p1.x - p2.x) / block;


for (int i = 0; i < Num_row; i++)
{
    for(int j = 0; j < Num_cols; j++)
{
    int  x1 = p1.x + j * block;
    int  y1 = p1.y + j * block;
    int avg = sum / block*block;


      // assign each pixel value by the block value



      } 
   }
      int main(void)
      {
image = imread("C:/Users/faho0odywbas/Desktop/test.jpg");

namedWindow("Demo");
setMouseCallback("Demo", onMouse);

imshow("Demo", image);
waitKey(0);

return 0;
      }

I want to draw a rectangle that's blur every thing inside it by mosaic effect, so my question is how to compute the block and assign each pixel value by the block value which are missing on my code

So the rectangle will be like this

This is my code

      #include <opencv2/core/core.hpp>
      #include <opencv2/highgui/highgui.hpp>

      using namespace std;
      using namespace cv;

      Mat image;
      char click;
      Point p1;
      Point p2;
      static void onMouse(int event, int x, int y, int, void*)
      {

switch (event)
{
case CV_EVENT_LBUTTONDOWN:
        if (click == 0){ // first click  top left
    click = 1;
    printf("%d %d", x, y);

    }
    else {          // second click  bottom right
    click = 2;
    printf("%d %d", x, y);
    }

    break;
case CV_EVENT_LBUTTONUP:
    break;
  }


      }

      void blurImage() {
      // compute the block



  int Num_cols = (p2.x - p1.x) / block;


      int Num_row = (p1.x - p2.x) / block;


for (int i = 0; i < Num_row; i++)
{
    for(int j = 0; j < Num_cols; j++)
{
    int  x1 = p1.x + j * block;
    int  y1 = p1.y + j * block;
    int avg = sum / block*block;


      // assign each pixel value by the block value



      } 
   }
      int main(void)
      {
image = imread("C:/Users/faho0odywbas/Desktop/test.jpg");

namedWindow("Demo");
setMouseCallback("Demo", onMouse);

imshow("Demo", image);
waitKey(0);

return 0;
      }

I want to draw a rectangle that's blur every thing inside it by mosaic effect, so my question is how to compute the block and assign each pixel value by the block value which are missing on my code

So the rectangle will be like this