Hi3516dv300开发板板载摄像头IMX290在/dev/目录下的设备名是啥？或者说如何虚拟出设备名？

Question

我用opencv打开Hi3516DV300开发板板载的摄像头时，提示错误：

~/mnt/app/src # ./people
[ WARN:0] global /home/vmuser/share/opencv/opencv/modules/videoio/src/cap_v4l.cpp (880) open VIDEOIO(V4L2): can't find camera device
can not open camera or video file

代码是：

VideoCapture cap;//打开摄像头对象

    bool update_bg_model = true;
    cap.open(-1);
   // cap.open("http://113.57.246.23:8080/shot.jpg");
    //cap.open("./v1.avi");
    //cap.open("rtsp://admin:Admin12345@192.168.1.65:554/ch1/main/av_stream?tcp");
    //cap.open("D:\\qq\\demo\\vtest.avi");  
    if (!cap.isOpened())
    {
        printf("can not open camera or video file\n");
        return -1;
    }

求教各位大神，望指点。