Sorry about that, I found the camera panel and the examples work fine. But not the effect with my HUDText object.
I added a HUD empty object, and I attached a HUDRoot script to it, then I added a HUDText with the 2 scripts HUDText and UIFollow, and a label as a child. The label goes to the cube as expected, but nothing is happening.
I put enclosed some pictures
Thanks for your help