Is NMR possible using nitrogen as the nucleus?
Of course yes -- because of the spin $\ce{^{15}N}$ and the much lesser used $\ce{^{14}N}$ nuclei posses:



The image is from here, the site provides some useful additional  overview to the source mentioned by @orthocresol.



P.S. If there were no NMR active nitrogen nuclei, 3D NMR would not this widespread in protein research:



(source)