Movement is one of the most important things to consider when designing for VR. The rule is: give full control to users when it comes to moving around, otherwise they will likely suffer from motion sickness (the feeling caused by a lack of control of body motion). Visual and sound triggers – like reticles around objects and audio clues – should be used to catch users' attention and guide them to focus on what's important. Automated transitions like zooming in or out should not be used. See here for more on this.