// import relevant libraries
// Define BlobDetection object to make it global
BlobDetection myDetector;

void setup() {
  size(320,240);
  // instantiate BlobDetection with screen size (assuming this is the same as your video size)
  myDetector = new BlobDetection(width,height);
  // You may want to call additional methods on myDetector to adjust sensitivity etc...
}

void draw() {
  // get pixels array from whatever video library you're using...

  // Pass the pixels array to the BLobDetector
  myDetector.computeBlobs(videoPixelsArray);

  // iterate through the current Blobs
  for (int i=0; i<getBlobNb (); i++) {
    Blob myBlob = getBlob (i);
    ellipse(myBlob.x,myBlob.y,10,10);
  }
}