Can I zoom in and out of virtual tours?

Yes, you can. When creating a virtual tour, you can even define minimum and maximum values of zoom allowed for the viewers of your tours. Auto-pilot navigation also includes zoom options.

Previous Can I use a tour's URL to define or modify the panorama or media with which the tour will start (deep linking)?
Next Can the virtual tours created with 3DVista software be controlled without touching the screen, just by spinning my mobile devices?