Thanks Martin. I did not have the plug-in. Now the nulls are pasted no problem and the grass did seem to be tracked. But I'm still having issues with this (simple I'm sure).
I tried creating a 3D text layer but can't seem to see the text anywhere. I tried moving it in front of the camera but it didn't seem to work.
Also, I don't know how to apply the track to it. I watched the first part of a webinar Imagineer Systems put out on 3d Tracking and it looked easy (always does when people are good at doing something). In the webinar after the nulls and camera were pasted in, it seemed like the person simple created a solid and used a BCC plugin to make the 3d text. But what I did not see is how this was parented to the null or camera; it somehow just worked. I'm sure I'm missing something simple but feel that I'm so very close.