Unable to handle popup of hybrid app in iOS

I am automating a hybrid application using Testng framework.
Platform: iOS 8.3
Appium version: 1.3.7
Issue is that i am unable to access the elements displayed in the login modal which is displayed as a popup on the desktop site.
I have tried using appium inspector but the elements inside the web view cannot be located.
Please help on how to handle such popups that are rendered as a page on mobile device.
Refer to the attached screenchots.

I am also facing same issue. Did you get any solution?