If you really want video, you can use one of those screen capture programs, like Snapz Pro X (mac) or Camtasia (win).
But maybe you could instead just write the parameters of your patch to a file with a small time interval (maybe 20-100 ms or so), like you would record automation in a DAW. That way you can actually have the patch 'reproduce' the composition, if you manage to add all the relevant parameters.
Check out [text] or [coll] for writing data to a file. You can think about adding a timestamp to every line of data you add, so there is some info about the speed of playback in the data itself.