Possibly helpful: http://meta.graphicdesign.stackexchange.com/questions/790/how-to-embed-screen-capture-videos-as-animated-gifs-in-answersHow to embed screen capture videos as animated gifs in answers?
There are a number of screen recorders which will create small 10FPS video clips. The mistake most make is trying to create 30FPS when it's not needed.
You would need to build out any PSD to actual, live, functioning screens/pages. Otherwise, you need to get familiar with building animations in Photoshop, although that may take far more time. But you cna render video from Photoshop.