Yes, here's an example. The viewpoint will go through the avatar but the ball will collide with it:
Code:
import viz
viz.go()
viz.collision(viz.ON)
viz.eyeheight(1.5)
viz.phys.enable()
dojo = viz.addChild('dojo.osgb')
dojo.collideMesh()
avatar = viz.addAvatar('vcc_male2.cfg',pos=[0,0,5],euler=[180,0,0])
avatar.collideBox()
avatar.disable(viz.INTERSECTION)
ball = viz.addChild('beachball.osgb',pos=[0,5,5])
ball.collideSphere()