The procedure to let your app have an access to different features of the device camera is to use camera API which will allow the app to make in-app camera activities. If you have a hybrid app go for Cordova plugin to enable this feature. You can just go to android open source site and get the fix to your problem.
This forum thread discusses How to use the video camera in an app?. You can join the discussion by clicking on 'Post a reply'. If you are new to iOS Developers Forum, you will need to sign up and create a new account.