Cmake specify opencv version

cmake_minimum_required(VERSION 3.4)

project(xxxx)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -O3 -std=c++11")

set(EXECUTABLE_OUTPUT_PATH ${PROJECT_SOURCE_DIR}/workspace/bin)

set(OpenCV_DIR opencv/lib/cmake/opencv4)
find_package(OpenCV 4.5 REQUIRED)
message(STATUS "OpenCV_DIR = ${OpenCV_DIR}")
message(STATUS "OpenCV_INCLUDE_DIRS = ${OpenCV_INCLUDE_DIRS}")
message(STATUS "OpenCV_LIBS = ${OpenCV_LIBS}")


set(OPENCV_LIBS
    opencv_core
    opencv_highgui
    opencv_imgproc
    opencv_imgcodecs
    opencv_video
    opencv_videoio
)


add_executable(pro  src/main.cpp)


target_link_libraries(
    pro
    ${OPENCV_LIBS}
)