Needless to say, don’t try this without the supervision of a professional.  Here is a bit more on the trick they use in this video:

Using this trick with liquid nitrogen, it is possible to create solid nitrogen at a temperature of -210C. We then poured the solid and liquid nitrogen mixture onto a tray of water. The surface of the water became so cold that CO2 solidified out of the atmosphere on its surface. Then, since CO2 does not pass through the liquid phase at atmospheric pressure, it was propelled on the water surface by jets of gas as it sublimed.

We hope you like the video.  It is kind of unusual in that we often think of nitrogen mostly in liquid form!