Merge pull request #25252 from gursimarsingh:cpp_samples_cleanup

Move API focused C++ samples to snippets #25252

Clean Samples #25006
This PR removes 39 outdated C++ samples from the project, as part of an effort to keep the codebase clean and focused on current best practices.

modules/video/include/opencv2/video/tracking.hpp

@@ -78,7 +78,8 @@ See the OpenCV sample camshiftdemo.c that tracks colored objects.
  */
 CV_EXPORTS_W RotatedRect CamShift( InputArray probImage, CV_IN_OUT Rect& window,
                                    TermCriteria criteria );
-/** @example samples/cpp/camshiftdemo.cpp
+
+/** @example samples/cpp/snippets/camshiftdemo.cpp
 An example using the mean-shift tracking algorithm
 */
 
@@ -345,7 +346,7 @@ double findTransformECC(InputArray templateImage, InputArray inputImage,
     TermCriteria criteria = TermCriteria(TermCriteria::COUNT+TermCriteria::EPS, 50, 0.001),
     InputArray inputMask = noArray());
 
-/** @example samples/cpp/kalman.cpp
+/** @example samples/cpp/snippets/kalman.cpp
 An example using the standard Kalman filter
 */
 
@@ -430,6 +431,9 @@ CV_EXPORTS_W Mat readOpticalFlow( const String& path );
  */
 CV_EXPORTS_W bool writeOpticalFlow( const String& path, InputArray flow );
 
+/** @example samples/cpp/snippets/dis_opticalflow.cpp
+An example using the dense optical flow and DIS optical flow algorithms
+*/
 /**
    Base class for dense optical flow algorithms
 */