Hey @waqarmirza572, happy to help!
Glad the iFrame is working. 
Here are a few ideas to get handle the iFrame redirect after a meeting has ended / participant has left:
Set the post attendee url
Or
Try adding an event handler when someone clicks the end button: https://stackoverflow.com/questions/13214522/iframe-button-click-event.
Or
Listen for the Meeting Ended / Participant Left Webhook and implement code that closes the iFrame on your frontend.
Or
Make a custom button that lives outside the iFrame that ends and closes the meeting.
Or
Detect a redirect in the iFrame and close the iFrame. https://stackoverflow.com/questions/10301193/detect-redirect-in-iframe
Thanks,
Tommy