var permissions = cordova.plugins.permissions;

permissions.hasPermission(permissions.CAMERA, function( status ){
    if ( !(status.hasPermission) ) {
        permissions.requestPermission(permissions.READ_CONTACTS, success, error);
 
        function error() {
          console.warn('Camera permission is not turned on');
        }
         
        function success( status ) {
          if( !status.hasPermission ) error();
        }
    }
  });