Hello,
I have done PT of i-PAD application using same method and I was successful.
Try to run the script and if it fail then do correlation, for parameterization you need to find out the values that you have pass in application while recording your script and onces you script running fine on VuGen and go to replay/recording and select the values that you want to add for test check.
Let me know if you need more help.
Thanks,
Deepak