App Ops is the Android 4.3 and 4.4 Hidden App Permission Manager.
This app lets you decide what you wanted to allow each app to do. Like access your location, accessing your camera, etc.
Once you pick an app, you’ll get a screen with easy on/off buttons for each permission.
This also tells you the last time each individual permission was used.
For some permissions, the app has to make use of them before they will show up in App Ops.
There is a Pro-version, which you can buy through an in-app purchase, allows for displaying
notifications of which permissions are being denied by your current app.
Unfortunately it is inaccessible to the user by default, in fact it is hidden until an app is chosen.