MATLAB: After converting video into frame, and appling frame differencing method to subtract two image, now i want to draw boundary in foreground of video, how

Question

%%Extracting & Saving of frames from a Video file through Matlab Code%%
clc;
close all;
clear all;
% assigning the name of sample mp4 file to a variable
filename = 'C:\Users\Hp\Desktop\xyz.mp4';
%reading a video file
mov = VideoReader(filename);
%getting no of frames
numFrames = mov.NumberOfFrames;
%setting current status of number of frames written to zero
numFramesWritten = 0;
%for loop to traverse & process from frame '1' to 'last' frames 
for t = 1 : numFrames
currFrame = read(mov, t);    %reading individual frames
opBaseFileName = sprintf('%3.3d.png', t);
opFullFileName = fullfile('C:\Users\Hp\Desktop\col1', opBaseFileName);
imwrite(currFrame, opFullFileName, 'png');   %saving as 'png' file
progIndication = sprintf('Wrote frame %4d of %d.', t, numFrames);
disp(progIndication);
numFramesWritten = numFramesWritten + 1;
end       %end of 'for' loop
progIndication = sprintf('Wrote %d frames to folder "%s"',numFramesWritten, 'C:\Users\Hp\Desktop\col1');
disp(progIndication);
%End of the code
%frame differncing code
I=imread('C:\Users\Hp\Desktop\col\001.png');
   I1=rgb2gray(I);
imshow(I1);
J=imread('C:\Users\Hp\Desktop\col1\001.png');
I1=rgb2gray(I);
J1=rgb2gray(J);
imshow(I1);
imshow(J1);
K=I1-J1;
figure;
imshow(K);
title('SUBTRACTED IMAGE ');

Answer 1

Use rectangle() or plot() to put lines into the overlay. Use text() to put words/strings into the overlay. You might have to put "hold on" first though.