title: detect Flash-accessible camera without prompting user for access to camera if one exists
body: <p>From a Flash object, I would like to be able to <em>detect the presence of</em> a webcam that the user <em>might</em> grant access to, without actually asking the user whether they want to grant access.  This is to streamline a large application that has extra features if a webcam exists &mdash; if there is a webcam, the application will present several dialogs that lead up to the normal cam-security prompt, but if the user doesn't have the hardware, I want to skip over them altogether.  Requesting access to the cam before those dialogs won't make sense to the user.</p>
  
  <p>It appears not to be possible to call <code>Camera.getCamera()</code> without the security prompt happening.  Is there a workaround?  (For instance, could I, perhaps, call <code>getCamera</code> in a hidden Flash object and inspect its return value, or does it block until the user acknowledges the  security prompt?)</p>