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  Note: Please note that you have posted 2 questions, in a single post. The first question with all its requirements is answered below. Please ask the second question in a separate post)

  (*If any doubt, please let me know in the comments)

  Matlab Code:

  clc;
  clear all;
  close all;

  i1 = imread('coins.png');
  imshow(i1); %showing the read image
  Mask=zeros(size(i1)); %creating mask the same size of image
  Mask(:)=255;
  [x,y] = ginput(2); %this will store the coordinates of points clicked by user
  Mask(min(y):max(y),min(x):max(x)) = 0;
  i2 = bitor(i1,Mask);
  imshow(i2); %show the resulting image

  Input image used for testing:

  

  Output Screenshot (After clicking on 2 points on the image):

  

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