ignore viz tutorials when BUILD_opencv_viz is not set

samples/cpp/CMakeLists.txt

@@ -28,6 +28,9 @@ if(BUILD_EXAMPLES AND OCV_DEPENDENCIES_FOUND)
   if(HAVE_opencv_gpufilters)
     ocv_include_directories("${OpenCV_SOURCE_DIR}/modules/gpufilters/include")
   endif()
+  if(HAVE_opencv_viz)
+    ocv_include_directories("${OpenCV_SOURCE_DIR}/modules/viz/include")
+  endif()
 
   if(CMAKE_COMPILER_IS_GNUCXX AND NOT ENABLE_NOISY_WARNINGS)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-unused-function")
@@ -55,6 +58,10 @@ if(BUILD_EXAMPLES AND OCV_DEPENDENCIES_FOUND)
     if("${srcs}" MATCHES "gpu/")
       target_link_libraries(${the_target} opencv_gpuarithm opencv_gpufilters)
     endif()
+    
+    if(HAVE_opencv_viz)
+      target_link_libraries(${the_target} opencv_viz)
+    endif()
 
     set_target_properties(${the_target} PROPERTIES
       OUTPUT_NAME "cpp-${sample_kind}-${name}"
@@ -82,6 +89,10 @@ if(BUILD_EXAMPLES AND OCV_DEPENDENCIES_FOUND)
   if(NOT HAVE_opencv_gpuarithm OR NOT HAVE_opencv_gpufilters)
     ocv_list_filterout(cpp_samples "/gpu/")
   endif()
+  
+  if(NOT HAVE_opencv_viz)
+    ocv_list_filterout(cpp_samples "viz")
+  endif()
 
   foreach(sample_filename ${cpp_samples})
     get_filename_component(sample ${sample_filename} NAME_WE)