Unfortunately, the simulator is known to crash like this. Do check to ensure that opentok.bundle is being correctly copied into your app's target, and otherwise stick to running on physical iOS devices. Avoid initializing a publisher instance if you must run in the simulator.
But, even with publisher initialization it was working completely on iPad version 5.1 (iPad device + simulator). opentok.bundle is copied correctly. *Currently i am using basic tutorial provided by OpenTok/iOS Sample.