Lazy way to check if a device supports getUserMedia.

getUserMedia.js

function getUserMedia() {
  // Since sometimes there's API support but stuff doesn't actually work, make a usage test.
  // Add a fake image file input to memory.
  var input = $('<input type="file" accept="image/*" capture="camera">');

  // Test if input is enabled.
  return input.is(':enabled'); // `true` if device actually supports getUserMedia API.
}

Tested both on iOS (3.3, 4, 5 and 7) and Android version (2.2, 2.3 and 4.0).