If you like it so much, why don't you take a picture... (which is easy with this Windows 8 Photo/Camera app dev link round-up)
Just spotted these 2 handy guides for anyone developing Windows Store device apps.
“This document describes how you can develop a Windows Store app for printers and assumes a working knowledge of how to author a Windows Store app for Windows 8.”
"Windows 8 apps easily access all the sensors on a Windows 8 machine. But Windows 8 apps can’t access any sensors on a Windows 8 machine without first asking the user’s permission.
Windows 8 apps are safe. That’s fundamental. Where desktop apps could (and can) do whatever the developer wants, Windows 8 apps are limited only to what the user allows.
Developers ask for device access by the application manifest. This XML file is in every Windows 8 app. It is manipulated by the GUI editor or notepad (for the die hard).
The manifest is how applications tell the operating system what sensors it intends to use. Just the manifest is not enough. Once requested, the operating system will verify access with the user first.
Important note: checking webcam lets you capture photos. However, to capture video (including access to the vide stream) you need to ask for webcam and microphone. That’s just how it works.
Capture a Photo
Declaring certain capabilities in your app manifest makes us think your app collects the corresponding private information. For example, declaring Internet capabilities (internetClient, internetClientServer) in the app manifest makes us think you're collecting the IP number of the user.