Intentionally blurred picture?

I'm borrowing my friends Nikon D3100 and would like to create (in a separate program, if necessary) or (preferably) take a picture with my body in a stationary position and a blurred picture of my head in multiple different positions, something like 3:26-3:28 in the music video Ich Tu Dir Weh (found here: http://vimeo.com/...m/13543478 ).
I know I have to decrease shutter speed (I've used about 1 second the past couple of attempts), but every time I try taking the picture with the only alteration being the difference in shutter speed, the image of my face is really, really faded. Any idea how to obtain the effect I'm looking for?

Take the picture normally then blur your head separately in the computer using Irfanview (freeware).

You can get desired result by using an external flesh.fire the flesh during long exposure without mounting it on camera.control the flesh light by aperture manually.long exposure gives u shaky image & flesh gives one or more sharp images.