title: Camera Always working in React Native Router Flux Scene
body: <p>I am looking React Native Router flux and did everything I want, except Camera.
  The structure of Router is like this.</p>
  
  <pre><code>&lt;Router ...&gt;
    &lt;Scene tabs&gt;
      &lt;Scene /&gt;        // Scene1
      &lt;Scene /&gt;        // Scene2
    &lt;/Scene&gt;
  &lt;/Router&gt;
  </code></pre>
  
  <p>Scene2 is QR Scanner.
  And if app is running, both scene1 and scene2 loaded at same time, and camera always working even though I am at Scene1.
  So My devices blows and it seems to explode.</p>
  
  <p>How can I stop camera when I am working on Scene1?</p>