What did you tried so far? Creating video from set of images shouldn't be a problem. Whole process is well described in MATLAB documentation.
So if I understand correctly, your problem might be about how to get image from your data (with same colors) as it's displayed by imagesc. Is that right? Documentation says:
imagesc (C) displays the data in array C as an image that uses the full range of colors in the colormap. Each element of C specifies the color for 1 pixel of the image.
If you can create indexed image from your data then you can easily add this image as next frame to your video. (see documentation link above). Your image has to use the full range of colors in the colormap to get same results as with imagesc(). This link might help you with that: Save an intensity image created with imagesc with true resolution
With these information you should be able to solve your problem. If you have any questions, something is not clear enough, or you have problems with your code, feel free to ask me, I will try to help you.
