I have found in the AppStore an application called iWebcamera (4.99$). This application is providing a virtual webcam to any Windows/OSX thru a driver that you need to install on your computer and that is connecting to your iPhone running iWebcamera.
The concept is really interesting as you can use your iPhone (3gs) as a wireless webcam. So I contacted the developpers to have some more information about the application and to find out if it would be possible to connect to the iWebcamera app in Linux. Guess what? It is possible, and without having to create a driver at all...
It is quite easy to use. Find out the IP adress of your iPhone, then you can use this gstreamer pipeline to test it:
(Of course, put your IP adress that your iPhone is using...)
So, it means that WebcamStudio is also able to use the iPhone as a wireless webcam using the Pipeline plugins...
In a file called iWebcamera.wspl, put that line:
Then, using the source browser, make sure to scan the folder where the iWebcamera.wspl is located. The plugin should show-up in the node "Pipelines".
Make sure that iWebcamera is running before starting the source. Double-click on the WSPL, and you should see the video stream in WS4GL as if it was another webcam.