Access to the camera of a macbook

Hello, I am just a starter on matlab and so i have some difficulties to get an access to the built-in-camera of my macbook with matlab I am using Matlab_R2014, Image Acquisition Toolbox and mac os x 10.10 None of the example will work and I always get this error Error using videoinput (line 217) Invalid ADAPTORNAME specified.

and imaqhwinfo answers this

ans =

    InstalledAdaptors: {'dcam'}
        MATLABVersion: '8.3 (R2014a)'
          ToolboxName: 'Image Acquisition Toolbox'
       ToolboxVersion: '4.7 (R2014a)'

So that the issue, perhaps anyone is so kind to help me.

greetings UWe