Enable camera lens IF in WP8 platform - windows-phone-7

I have a program called Cam & Weather and I am supporting Windows Phone 7.x and Windows Phone 8 platform. This application uses camera. What I'd like to have in the next version is to detect a device if running in Windows Phone 8, so I can register the application for Camera Lens.
I'd like to know how to do this? IF the user installed the application in Windows Phone 8, How do you register the application for Camera Lens?
Thanks

You can't support Lenses with an app that targets both Windows Phone 7 & Windows Phone 8 with the same XAP.
You will have to upgrade your project to Windows Phone 8 in order to use the new APIs.
If you still want to maitnain a WP7 version of the app, you should look at the options listed here.

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