I wanna write a "DriectShow Source Filter" for using webcam.
But I would know is the any way not using "Windows SDK"?
Yes, it is possible to create a DirectShow filter without using Windows SDK base classes. A filter is nothing but a COM class implementing a set of COM interfaces, some of which are mandatory (IBaseFilter, IPin) and other are optional. SDK BaseClasses are helpers to give a quick start but if you want to do it from fresh - it's absolutely possible.