Forming a giant array of multiple 64 x 64 matrices

[file path] = uigetfile('*.avi','Pick a Video');% this line opens a pop up window so that you can choose your video for further processing     
video = VideoReader([path file]);% the video chosen through UI get stored in video object
numOfFrames = video.NumberOfFrames;% this will be a number (total number of frames in your chosen video)
%allFrames = read(video);% catching all the frames from the video in object allFrames
for i=1:1:numOfFrames
  try
      lFrame = read(video, i);%frames(:, :, :, i);
  catch
      break;
  end
  lRFrame = lFrame(:,:,1);
  lGFrame = lFrame(:,:,2);
  lBFrame = lFrame(:,:,3);
  lGray = 0.299*lRFrame + 0.587*lGFrame + 0.114*lBFrame;
  grayImage = imresize(lGray, [256 256]);

    % step 2 of the algorithm begins from here %
    meanFilterFunction = @(theBlockStructure) mean2(theBlockStructure.data(:)) * ones(1,1, class(theBlockStructure.data));

    blockSize = [4 4];
    blockyImage4 = blockproc(single(grayImage), blockSize, meanFilterFunction);

I am getting a 64 x 64 image in 'blockyImage4' but since it is in a loop , the value flushes itself in very next iteration everytime.

I want an array of images which can store (possibly all) images(matrices). and i should have access to them all. if all the images could not be stored in an array then how to store only two images of consecutive iterations since i need 'i' and "i+1" th image to find out the diffrence between them. Please help