What lens is this???

I do think it is a 50mm-ish lens. The reason they can get so close is because it's a macro-lens, it can focus extremely close!
 
if you want to experiment with macro, it is probably a good idea to start with a cheap set of macro tubes, such as these:
http://www.amazon.com/gp/product/B0...=1789&creative=390957&creativeASIN=B003Y60DZO

you put some of those between the camera and any lens you already own (so that the lens sits farther away from the sensor) and you can focus much, much closer (even a lot closer than what you see in those videos) (you lose infinity focus while the tubes are mounted, though)

downsides:
* you lose all auto features: AF won't work, IS won't work, and if there's no way to control iris aperture in the lens itself it will be stuck at the aperture it had when it was taken away from the camera last time (usually, wide open; you can press DoF preview before to you take it out and it will get stuck at any other aperture you want)
* image quality is very good, but not as good as with a dedicated macro lens (which will usually have floating elements to preserve image quality even when focusing very close) (I think image quality is better with macro tubes than with most other "cheap" alternatives, such as reverse-mounting the lens or adding a macro element in front)

but it's extremely cheap, and it works; and will also allow you to find out which focal lengths you like most for macro work (before you spend big bucks on a real macro lens, if you think you're going to use it a lot)


edit: this comes up relatively often, so I updated my photography tutorial with a new small section on macro:
http://www.similaar.com/foto/tuten/520.html
 
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More than one lens at work here...

I would start with a fast macro lens that is 2x the focal length of the normal lens for the format you are shooting.

So for the GH-2 it would be the Olympus 50mm f/2.0 4/3 Macro with and adapter to fit the GH-2.

For a Canon 5D MK2 it would be the Canon 100mm f/2.8 Macro or the Zeiss 100mm f/2.0 Macro lens.
 
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