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sudo apt-get install gcc g++ cmake
sudo apt-get install build-essential libgtk2.0-dev libavcodec-dev libavformat-dev libjpeg-dev libswscale-dev libtiff5-dev libgtk2.0-dev

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wget https://github.com/opencv/opencv/archive/4.5.5.zip
unzip 4.5.5.zip
cd opencv-4.5.5 && mkdir build && cd build

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sudo cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local ..
sudo make -j8
sudo make install

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Project Folder
├─build
├─include
├─src
│   └─ main.cpp
└─CMakeLists.txt

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cmake_minimum_required(VERSION 3.0.0)
project(projectName VERSION 0.1.0)

set(CMAKE_CXX_STANDARD 17)
include_directories(${PROJECT_SOURCE_DIR}/include)

find_package(OpenCV REQUIRED)

aux_source_directory(./src SrcFiles)
set(EXECUTABLE_OUTPUT_PATH  ${PROJECT_SOURCE_DIR}/build)
add_executable(main ${SrcFiles})

target_link_libraries(main ${OpenCV_LIBS})

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git clone git@github.com:microsoft/vcpkg.git
cd vcpkg
bootstrap-vcpkg.bat

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vcpkg install opencv4:x64-windows

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Project Folder
├─.vscode
│   └─ c_cpp_properties.json
├─build
├─include
├─src
│   └─ main.cpp
└─CMakeLists.txt

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{
    "configurations": [
        {
            "name": "Win32",
            "includePath": [
                "${workspaceFolder}/**",
                "${vcpkgRoot}/x86-windows/include"
            ],
            "defines": [
                "_DEBUG",
                "UNICODE",
                "_UNICODE"
            ],
            "windowsSdkVersion": "10.0.19041.0",
            "compilerPath": "C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.30.30705/bin/Hostx64/x64/cl.exe",
            "cStandard": "c17",
            "cppStandard": "c++17",
            "intelliSenseMode": "windows-msvc-x64",
            "configurationProvider": "ms-vscode.cmake-tools"
        },
        {
            "name": "Win64",
            "includePath": [
                "${workspaceFolder}/**",
                "D:/vcpkg/installed/x64-windows/include"
            ],
            "defines": [
                "_DEBUG",
                "UNICODE",
                "_UNICODE"
            ],
            "windowsSdkVersion": "10.0.19041.0",
            "compilerPath": "C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.30.30705/bin/Hostx64/x64/cl.exe",
            "cStandard": "c17",
            "cppStandard": "c++17",
            "intelliSenseMode": "windows-msvc-x64"
        }
    ],
    "version": 4
}

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cmake_minimum_required(VERSION 3.0.0)
project(projectName VERSION 0.1.0)

set(CMAKE_CXX_STANDARD 17)
include_directories(${PROJECT_SOURCE_DIR}/include)

IF(WIN32)
    SET(DCMAKE_TOOLCHAIN_FILE "D:/vcpkg/scripts/buildsystems/vcpkg.cmake")
    include("D:/vcpkg/scripts/buildsystems/vcpkg.cmake")
ENDIF()

find_package(OpenCV REQUIRED)

aux_source_directory(./src SrcFiles)
set(EXECUTABLE_OUTPUT_PATH  ${PROJECT_SOURCE_DIR}/build)
add_executable(main ${SrcFiles})

target_link_libraries(main ${OpenCV_LIBS})

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#include <opencv2/core/mat.hpp>
#include <opencv2/opencv.hpp>

int main(int, char**) {
    cv::VideoCapture cap;
    cap.open("rtmp://127.0.0.1:1935/live/stream");
    int FPS = cap.get(cv::CAP_PROP_FPS);
    while (cap.isOpened())
    {
        cv::Mat frame;
        cap >> frame;

        cv::Size dsize = cv::Size(640, 640);

        cv::Mat reFrame;
        cv::resize(frame, reFrame, dsize);

        cv::imshow("cv", reFrame);
        cv::waitKey(1);
    }
    return 0;
}