How to embed a small camera preview, and then save the whole screenshot image in iphone

I want to put a background image first, and then put a small camera preview view on the top of it.

When user clicked the ok button, a screenshot of the whole merged picture could be reproduced. I remember that some apps in appstore did this, just want to k开发者_JAVA技巧now how to achieve this in code.

Place your background image.. Over that place your imagepicker controller..

take screenshot using UIGetScreenImage