如何取消相机和导航到根视图控制器?

I have created 3 views. 1st view is home, 2nd is inventory and 3rd is overlay view. Now from home screen using pushviewcontroller, i am navigating to the inventory view screen. In inventory view i have one capture button. capture button will open camera on overlayview. Now the issue is there is a button called back button in the overlayview, when i click on this button i want to navigate to the home screen, but for that i need to 1st dissmiss the camera. How is this possible?I have created 3 views. 1st view is home, 2nd i