In the script that imports the vizconnect config you'll want to get a handle to the display (which includes the viewpoint) and whatever trackers/transports you'll want to set as the parent of the display. Then you can change the display's parent through the code. Here's a simple example:
Code:
import viz
import vizact
import vizconnect
vizconnect.go('vizconnect_config.py')
viz.addChild('piazza.osgb')
keyTracker = vizconnect.getTracker('keyboard')
mouseKeyTracker = vizconnect.getTracker('mouse_and_keyboard_walking')
display = vizconnect.getDisplay()
vizact.onkeydown('1',display.setParent,keyTracker)
vizact.onkeydown('2',display.setParent,mouseKeyTracker)