I have been extremely busy having people visiting this last week. I have also been busy making a film for the Kickstarter I am making together with @nevies. Tonight my computer will have to do the main part of the work. It has to go through the 14 hours of rendering the Katharsisdrill mask that I have set up in Blender.
Screen shot from Blender
After that I will have to do the compositing and some editing, and then it should be ready to go. I have used a lot of time making the sound and the initial edits, and also some time relearning it all, but as I have many more films i need to be making it is not wasted time.
The technique used for this is motion tracking. You can see how it is done here.