Xamarin.Android How can i stream my camera in axml?

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Hi guys i search for an example where i see how i can stream my camera in axml layout. I know the sample "Moments" from here github.com/pierceboggan/Moments but that is too much. I only want to stream my camera in my layout. Nothing more no overlay or other stuff. Like Snapchat but without the Button. How can i do that? Someone a Solution?

If not i have another question. Do someone know how i can use this components.xamarin.com/view/zxing.net.mobile barcodescanner like a Snapchat Camera? I want a barcodescanner with is already opened with my layout (stream). No buttons witch open the scanner or something like that. I hope you guys know what i mean. Pleas help me in one of my both problems.