I fixed the problem by following the answers given here:
Although it was a d435 not the d415 I followed the same steps. I uninstalled the device and the drivers than made sure the intel realsense camera was registered as Microsoft. Then uninstalled all nuitrack files and reinstalled it making sure the NUITRACK_HOME variable was set correctly. Afterwards I tested nuitrack_c11 example and it worked; the c11 example did not work before I took these steps. Afterwards the unity examples worked.
I do not know whether it was the registering the camera differently or reinstalling nuitrack that worked, but those were the steps I took and it worked.