videocapture is not working in opencv 3.4.0

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I have an .mp4 video saved in the path (D:\Personal\workspace\FirstVideo.mp4) and in the code when i call videocapture cap("filepath") it is returning false everytime and prints "cannot open the video file". Below is the code snippet. I have added the libopencv_videoio340 library in my eclipse c++ settings. Everytime when i run my code, it always prints "cannot open the video file", I have no clue now how to proceed o this. Can anyone help me on this? Thanks in advance!!!

//==================================
//Code snippet
//==================================
#include <opencv2/opencv.hpp> 
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>

using namespace cv;
using namespace std;

int main( int argc, char** argv)
{
    //open the video file for reading
    VideoCapture cap("D:\\Personal\\workspace\\FirstVideo.mp4");

    if(cap.isOpened() == false)
    {
        cout<<"cannot open the video file"<<endl;
        cin.get();
        return -1;
    }

    //get the frames rate of the video
    double fps = cap.get(CAP_PROP_FPS);
    cout << "Frames per seconds : " << fps << endl;

    // Create a window for display.
    namedWindow( "First Test Video", WINDOW_AUTOSIZE );

    while (true)
    {
     Mat frame;
     bool bSuccess = cap.read(frame); // read a new frame from video

     //Breaking the while loop at the end of the video
     if (bSuccess == false)
     {
      cout << "Found the end of the video" << endl;
      break;
     }
     imshow( "First Test Video", frame );
     waitKey(0);
    }
   return 0;
}