You can change the camera handler and link the avatar to the viewpoint:
Code:
import viz
viz.go()
ground = viz.add('tut_ground.wrl')
avatar = viz.add('vcc_male.cfg')
avatar.state(2)
link = viz.link(viz.MainView,avatar)
link.preTrans([0,-1.8,2])
import vizcam
viz.cam.setHandler(vizcam.FlyNavigate())