videoio: deprecate Video for Windows (VFW)

consider using MSMF backend

CMakeLists.txt

@@ -231,7 +231,7 @@ OCV_OPTION(WITH_CUFFT          "Include NVidia Cuda Fast Fourier Transform (FFT)
 OCV_OPTION(WITH_CUBLAS         "Include NVidia Cuda Basic Linear Algebra Subprograms (BLAS) library support" ON IF (NOT IOS AND NOT WINRT) )
 OCV_OPTION(WITH_NVCUVID        "Include NVidia Video Decoding library support"                               ON IF (NOT IOS AND NOT APPLE) )
 OCV_OPTION(WITH_EIGEN          "Include Eigen2/Eigen3 support"               (NOT CV_DISABLE_OPTIMIZATION)       IF (NOT WINRT AND NOT CMAKE_CROSSCOMPILING) )
-OCV_OPTION(WITH_VFW            "Include Video for Windows support"           ON   IF WIN32 )
+OCV_OPTION(WITH_VFW            "Include Video for Windows support (deprecated, consider using MSMF)"  OFF  IF WIN32 )
 OCV_OPTION(WITH_FFMPEG         "Include FFMPEG support"                      ON   IF (NOT ANDROID AND NOT IOS AND NOT WINRT) )
 OCV_OPTION(WITH_GSTREAMER      "Include Gstreamer support"                   ON   IF (NOT ANDROID AND NOT IOS AND NOT WINRT) )
 OCV_OPTION(WITH_GSTREAMER_0_10 "Enable Gstreamer 0.10 support (instead of 1.x)"                              OFF )