Contact MathWorks and Use the webcamSupport Function
If you need support from MathWorks®, see Contact Support.
Before contacting MathWorks, run the webcamSupport function. This function returns
      following diagnostic information:
- Name of all the connected Webcams 
- Available properties in each webcam 
- Installed Support Packages 
- MATLAB version and Toolboxes Installed 
The output from webcamSupport is automatically saved to a log file,
        webcamSupport.log, which you can use to help troubleshoot your
      problem.
Note
The webcamSupport function will access all the webcams connected to
        your system and create webcam objects for each of them.
To have MATLAB® generate this file for you, type
webcamSupport