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You can use butterwoth filter : Something like this works :

vector<double> b={0.29213704255461020,0.58427408510922041,0.29213704255461020};
vector<double> a={0,0.36952737735124142,-0.19581571265583309};
Mat frameUSB;
Mat frame;
v >> frameUSB;
frameUSB.convertTo(frame, CV_32F);
for (int i = 0; i <= 20; i++)
{
    p.x.push_back(frame.clone());
    p.y.push_back(frame.clone());
}
while (code != 27)
{
    v >> frameUSB;
    frameUSB.convertTo(frame, CV_32F);
    p.x[0] = frame.clone();
    Mat r;
    r = b[0] * p.x[0];
    for (int i = 1; i < b.size(); i++)
    {
        r += b[i] * p.x[i]; 
    }
    for (int i = 1; i < a.size(); i++)
    {
        r += a[i] * p.y[i];
    }
    for (int i = b.size() - 1; i > 0; i--)
    {
        p.x[i] = p.x[i - 1];
    }
    for (int i = a.size() - 1; i > 1; i--)
    {
        p.y[i] = p.y[i - 1];
    }
    p.y[1] = r;
    imshow(p.nomfenetre, r/256);
    code = waitKey(1);
}

Full code is here