新建test文件夹，文件夹存在test.cpp和CMakeLists.txt

test.cpp
#include <iostream>

#include <string>

#include <sstream>

#include <opencv2/core.hpp>

#include <opencv2/highgui.hpp>

#include <opencv2/videoio.hpp> 

using namespace cv;

using namespace std;

const char* keys =

{

    "{help h usage ? | | print this message}"

    "{@video | | Video file, if not defined try to use webcamera}"

};

int main(int argc, const char** argv)

{

    CommandLineParser parser(argc, argv, keys);

    parser.about("Reading a video and camera v1.0.0");

    if (parser.has("help"))

    {

        parser.printMessage();

        return ;

    }

    String videoFile = parser.get<String>();

    if (!parser.check())

    {

        parser.printErrors();

        return ;

    }

    VideoCapture cap;

    if (videoFile != "")

    {

        cap.open(videoFile);// read a video file

    }else {

        cap.open();// read the default caera

    }

    if (!cap.isOpened())// check if we succeeded

    {

        return -;

    }

    namedWindow("Video", );

    while ()

    {

        Mat frame;

        cap >> frame; // get a new frame from camera

        imshow("Video", frame);

        if (waitKey() >= ) break;

    }

    // Release the camera or video file

    cap.release();

    return ;

}

CMakeLists.txt

project(test)

cmake_minimum_required(VERSION 2.8.7)

# option to enable OpenMP; only relevant for the KCF version with the

# VOT scale estimation

option(WITH_OPENMP "Enable OpenMP" OFF)

if(WITH_OPENMP)

    find_package(OpenMP REQUIRED)

    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")

    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}")

endif(WITH_OPENMP)

# add c++11 support

if(CMAKE_COMPILER_IS_GNUCC)

    ADD_DEFINITIONS ( -std=c++11 )

endif(CMAKE_COMPILER_IS_GNUCC)

# add OpenCV

set(OPENCV_DIR_HINT "")

if(WIN32)

    get_filename_component(OPENCV_DIR_PLATFORM $ENV{OPENCV_DIR} DIRECTORY)

    get_filename_component(OPENCV_DIR_HINT ${OPENCV_DIR_PLATFORM} DIRECTORY)

endif(WIN32)

set(OpenCV_STATIC OFF)

find_package(OpenCV REQUIRED HINTS ${OPENCV_DIR_HINT})

编译过程：

> cd test
> g++ test.cpp -o test `pkg-config --cflags --libs opencv`
> ./test