cvCaptureFromFile- Opening Video from specific path - Raspberry Pi - c++

Question

I have OpenCV-2.4.9 installed in Raspberry Pi. Right now I am trying to load a video from specific path and for that I tried with both C and C++ API
C API: cvCaptureFromFile(path);
C++ API: VideoCapture cap; cap.open(path)
I am getting error and it says could not open file.
It works well in Windows and Linux, but not in Raspberry Pi. Am I missing something?
C++ code:
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <opencv2/opencv.hpp>
using namespace cv;
using namespace std;
int main(){
VideoCapture cap("C:/Users/nava/Videos/file.mp4");
if (!cap.isOpened()){
cout << "Error opening video stream" << endl;
return -1;
}
while (1){
Mat Frame;
if (!cap.read(Frame)){
cout << "No Frame available" << endl;
waitKey();
}
imshow("output", Frame);
if (waitKey(33) == 27) break;
}
}
C Code:
#include "highgui.h"
int main(int argc, char** argv)
{
cvNamedWindow("video",CV_WINDOW_AUTOSIZE);
CvCapture* capture = cvCreateFileCapture("/home/pi/Desktop/test.mp4");
IplImage* frame;
while(1)
{
frame = cvQueryFrame(capture);
if(!frame) break;
cvShowImage("video", frame);
char c = cvWaitKey(33);
if(c == 27) break;
}
}

Answer 1

You have to install UV4L driver.Follow this tutorial :
http://www.linux-projects.org/modules/sections/index.php?op=viewarticle&artid=14