I’m trying to detect blobs of light so that I can make a multi touch screen so far my webcam can pick up the infrared light from the LEDs and with the use of FiducialTracker I can pick up the blobs but I am not tracking anything as there are no output values in my IOboxes for the x and y co-ordinates. How can I track my LEDs?

hello, seems to be a misuderstanding, fiducials are a set of markers that are recogniced by the tracker algorithm, they look like this:

the Contour node is supposed to track blobs, see help file.