Merge a sequence of video images to another

In motion detection you would want to combine your video to the original video. to do this, you combine your original video with the processed video.

the code:

clear all
close all
clc;
disp('Testing Purposes Only....');
fin = 'sampleVideo.avi';
avi = aviread(fin);
% Convert to RGB to GRAY SCALE image.
avi = aviread(fin);
pixels = double(cat(4,avi(1:2:end).cdata))/255; %get all pixels (normalize)
nFrames = size(pixels,4);
%get number of frames

for f = 1:nFrames
pixel(:,:,f) = (rgb2gray(pixels(:,:,:,f))); %convert images to gray scale
end

nrames=f;
for l = 2:nrames
d(:,:,l)=(abs(pixel(:,:,l)-pixel(:,:,1))); %subtract current pixel from background
z(:,:,l)=(abs(pixel(:,:,l)-pixel(:,:,l-1))); %subtract current pixel from previous

%------merge
fg= pixel(:,:,l); %foreground
bg= z(:,:,l); %background
alpha= 0.1; %alpha
dif = fg-bg;
out = bg + alpha.*dif;
imshow(out);
%--------
drawnow;
end

Results: