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you can skip some frames in the video file. if ratio is 0 you keep all frames ratio equal 1/2 ratio =3 1/4...

int main(int argc, char* argv[]) { VideoCapture cap("C:/Users/Desktop/Movements/Passing/2.outside of the foot.mp4");
if (!cap.isOpened()) // if not success, exit program { cout << "Cannot open the video file" << endl; return -1; }

//cap.set(CV_CAP_PROP_POS_MSEC, 300); //start the video at 300ms
double fps = cap.get(CV_CAP_PROP_FPS); //get the frames per seconds of the video
cout << "Frame per seconds : " << fps << endl;
namedWindow("MyVideo", CV_WINDOW_AUTOSIZE); //create a window called "MyVideo"
int nbFrame=0;
int ratio=3;
vector<Mat> selectedFrame;
while (1)
{
    Mat frame;

    bool bSuccess = cap.read(frame); // read a new frame from video
    nbFrame++;
    if (!bSuccess) //if not success, break loop
    {
        cout << "Cannot read the frame from video file" << endl;
        break;
    }
    if (nbFrame==ratio)
    {
          selectedframe.push_back(frame.clone());
          nbFrame=0;
    }
    else
          nbFrame++;
    imshow("MyVideo", frame); //show the frame in "MyVideo" window

    if (waitKey(30) == 27) //wait for 'esc' key press for 30 ms. If 'esc' key is pressed, break loop
    {
        cout << "esc key is pressed by user" << endl;
        break;
    }
}
return 0;
}

you can skip some frames in the video file. if ratio is 0 you keep all frames ratio equal 1/2 ratio =3 1/4...

int main(int argc, char* argv[])
     {
    {
VideoCapture cap("C:/Users/Desktop/Movements/Passing/2.outside of the foot.mp4"); 
  if (!cap.isOpened())  // if not success, exit program
    {
    {
    cout << "Cannot open the video file" << endl;
     return -1;
    }
 
}

//cap.set(CV_CAP_PROP_POS_MSEC, 300); //start the video at 300ms
double fps = cap.get(CV_CAP_PROP_FPS); //get the frames per seconds of the video
cout << "Frame per seconds : " << fps << endl;
namedWindow("MyVideo", CV_WINDOW_AUTOSIZE); //create a window called "MyVideo"
int nbFrame=0;
int ratio=3;
vector<Mat> selectedFrame;
while (1)
{
    Mat frame;

    bool bSuccess = cap.read(frame); // read a new frame from video
    nbFrame++;
    if (!bSuccess) //if not success, break loop
    {
        cout << "Cannot read the frame from video file" << endl;
        break;
    }
    if (nbFrame==ratio)
    {
          selectedframe.push_back(frame.clone());
          nbFrame=0;
    }
    else
          nbFrame++;
    imshow("MyVideo", frame); //show the frame in "MyVideo" window

    if (waitKey(30) == 27) //wait for 'esc' key press for 30 ms. If 'esc' key is pressed, break loop
    {
        cout << "esc key is pressed by user" << endl;
        break;
    }
}
return 0;
}