Do you want to offset the viewpoint linked to tracking data? If so, take a look at the following code. Using the
<link>.postTrans and
<link>postEuler operators, the viewpoint is offset 1 meter in height and 45 degrees in yaw from the tracking data.
Code:
link = viz.link(tracker,viz.MainView)
link.postTrans([0,1,0])
link.postEuler([45,0,0])