Move C API of opencv_video to separate file

modules/video/include/opencv2/video.hpp

@@ -7,11 +7,12 @@
 //  copy or use the software.
 //
 //
-//                           License Agreement
+//                          License Agreement
 //                For Open Source Computer Vision Library
 //
 // Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
 // Copyright (C) 2009, Willow Garage Inc., all rights reserved.
+// Copyright (C) 2013, OpenCV Foundation, all rights reserved.
 // Third party copyrights are property of their respective owners.
 //
 // Redistribution and use in source and binary forms, with or without modification,
@@ -46,13 +47,9 @@
 #include "opencv2/video/tracking.hpp"
 #include "opencv2/video/background_segm.hpp"
 
-#ifdef __cplusplus
 namespace cv
 {
-
 CV_EXPORTS bool initModule_video(void);
-
 }
-#endif
 
 #endif //__OPENCV_VIDEO_HPP__