Support for DrivePath

[pistorinoj]

Not sure if this is the right way to raise this issue but here goes.

It would be great if a feature was added to report the DrivePath for each camera.
Right now, all you can get is a FriendlyName.
While that is nice, it is not a unique name for each physical camera (i.e., two cameras of the same make and model will have the same name).
Camera calibration (for OpenCV for example) is specific to each physical device and can take a long time, etc. Thus, it is important to have a unique ID for each camera between sessions so that you can store and retrieve the calibration results.
Exposing the DirectShow DrivePath would allow this to be done.
Just add something similar to you getName that reports the DrivePath.