需要先编译好libfreenect2，调用就可以了，具体代码：

#include <iostream>
#include <stdio.h>
#include <iomanip>
#include <time.h>
#include <signal.h>
#include <opencv2/opencv.hpp>

#include <libfreenect2/libfreenect2.hpp>
#include <libfreenect2/frame_listener_impl.h>
#include <libfreenect2/registration.h>
#include <libfreenect2/packet_pipeline.h>
#include <libfreenect2/logger.h>
//! [headers]

using namespace std;
using namespace cv;

const int cl = 0;
const int gl = 1;
const int cpu = 2;

bool protonect_shutdown = false; // Whether the running application should shut down.

void sigint_handler(int s)
{
    protonect_shutdown = true;
}

int main()
{
    //! [context]
    libfreenect2::Freenect2 freenect2;
    libfreenect2::Freenect2Device *dev = NULL;
    libfreenect2::PacketPipeline *pipeline = NULL;
    //! [context]

    //! [discovery]
    if(freenect2.enumerateDevices() == 0)
    {
        std::cout << "no device connected!" << std::endl;
        return -1;
    }

    string serial = freenect2.getDefaultDeviceSerialNumber();

    std::cout << "SERIAL: " << serial << std::endl;
    //! [discovery]

    int depthProcessor = cl;

    if(depthProcessor == cpu)
    {
        if(!pipeline)
            //! [pipeline]
            pipeline = new libfreenect2::cpuPacketPipeline();
        //! [pipeline]
    } else if (depthProcessor == gl) {
#ifdef LIBFREENECT2_WITH_OPENGL_SUPPORT
        if(!pipeline)
            pipeline = new libfreenect2::OpenGLPacketPipeline();
#else
        std::cout << "OpenGL pipeline is not supported!" << std::endl;
#endif
    } else if (depthProcessor == cl) {
#ifdef LIBFREENECT2_WITH_OPENCL_SUPPORT
        if(!pipeline)
            pipeline = new libfreenect2::OpenCLPacketPipeline();
#else
        std::cout << "OpenCL pipeline is not supported!" << std::endl;
#endif
    }

    if(pipeline)
    {
        //! [open]
        dev = freenect2.openDevice(serial,pipeline);
        //! [open]
    } else {
        dev = freenect2.openDevice(serial);
    }

    if(dev == 0)
    {
        std::cout << "failure opening device!" << std::endl;
        return -1;
    }

    signal(SIGINT,sigint_handler);
    protonect_shutdown = false;

    //! [listeners]
    libfreenect2::SyncMultiFrameListener listener(libfreenect2::Frame::Color |
                                                  libfreenect2::Frame::Depth |
                                                  libfreenect2::Frame::Ir);
    libfreenect2::FrameMap frames;

    dev->setColorFrameListener(&listener);
    dev->setIrAndDepthFrameListener(&listener);
    //! [listeners]

    //! [start]
    dev->start();

    std::cout << "device serial: " << dev->getSerialNumber() << std::endl;
    std::cout << "device firmware: " << dev->getFirmwareVersion() << std::endl;
    //! [start]

    //! [registration setup]
    libfreenect2::Registration* registration = new libfreenect2::Registration(dev->getIrCameraParams(),dev->getColorCameraParams());
    libfreenect2::Frame undistorted(512,424,4),registered(512,depth2rgb(1920,1080 + 2,4); // check here (https://github.com/OpenKinect/libfreenect2/issues/337) and here (https://github.com/OpenKinect/libfreenect2/issues/464) why depth2rgb image should be bigger
    //! [registration setup]

    Mat rgbmat,depthmat,depthmatUndistorted,irmat,rgbd,rgbd2;

    //! [loop start]
    while(!protonect_shutdown)
    {
        listener.waitForNewFrame(frames);
        libfreenect2::Frame *rgb = frames[libfreenect2::Frame::Color];
        libfreenect2::Frame *ir = frames[libfreenect2::Frame::Ir];
        libfreenect2::Frame *depth = frames[libfreenect2::Frame::Depth];
        //! [loop start]

        cv::Mat(rgb->height,rgb->width,CV_8UC4,rgb->data).copyTo(rgbmat);
        cv::Mat(ir->height,ir->width,CV_32FC1,ir->data).copyTo(irmat);
        cv::Mat(depth->height,depth->width,depth->data).copyTo(depthmat);

        cv::imshow("rgb",rgbmat);
        cv::imshow("ir",irmat / 4500.0f);
        cv::imshow("depth",depthmat / 4500.0f);

        //! [registration]
        registration->apply(rgb,depth,&undistorted,&registered,true,&depth2rgb);
        //! [registration]

        cv::Mat(undistorted.height,undistorted.width,undistorted.data).copyTo(depthmatUndistorted);
        cv::Mat(registered.height,registered.width,registered.data).copyTo(rgbd);
        cv::Mat(depth2rgb.height,depth2rgb.width,depth2rgb.data).copyTo(rgbd2);


        cv::imshow("undistorted",depthmatUndistorted / 4500.0f);
        cv::imshow("registered",rgbd);
        cv::imshow("depth2RGB",rgbd2 / 4500.0f);

        int key = cv::waitKey(1);
        protonect_shutdown = protonect_shutdown || (key > 0 && ((key & 0xFF) == 27)); 

        //! [loop end]
        listener.release(frames);
    }
    //! [loop end]

    //! [stop]
    dev->stop();
    dev->close();
    //! [stop]

    delete registration;
    return 0;
}