Update cmake files by using CUDA_CUDA_LIBRARIES

samples/gpu/CMakeLists.txt

@@ -36,7 +36,12 @@ if(BUILD_EXAMPLES AND OCV_DEPENDENCIES_FOUND)
     set(the_target "example_${project}_${name}")
     add_executable(${the_target} ${srcs})
 
-    target_link_libraries(${the_target} ${OPENCV_LINKER_LIBS} ${OPENCV_GPU_SAMPLES_REQUIRED_DEPS} cuda)
+    target_link_libraries(${the_target} ${OPENCV_LINKER_LIBS} ${OPENCV_GPU_SAMPLES_REQUIRED_DEPS})
+
+    if(HAVE_CUDA)
+        target_link_libraries(${the_target} ${CUDA_CUDA_LIBRARY})
+    endif()
+
     if(HAVE_opencv_nonfree)
       target_link_libraries(${the_target} opencv_nonfree)
     endif()