The video was posted by ViziLeaks who also leaked photos of the device yesterday.
Un-announced Nokia LUMIA EOS PureView with 40 Mega Pixel Camera, you can see the shutter action with optical stabilization and focus, more to come...
"The Nokia EOS we have managed to get our hands on is big, black, and makes a bulge in our shorts when its in our pockets. It has a nice feel to it, solid, smooth, a bit weighty and we feel like the ultra hi-res snapper has a lot to do with this but we'll pick up in that area later. It feels cool and metallic, although not sure if it is actually metal or whether its a premium polycarbonate plastic, either way, it feels great in the hand."
Take a look at the video below or hit the link for more details about the device.