RotoCenterToTracker.py

def shapeCenter(node, shapeName, frame):
    shape = node['curves'].toElement(shapeName)
    x = 0
    y = 0
    for eachPoint in shape:
        x = x + eachPoint.center.getPosition(nuke.frame(frame))[0]
        y = y + eachPoint.center.getPosition(nuke.frame(frame))[1]

    # avarage of point value
    x = x / len(shape)
    y = y / len(shape)

    return [x, y]
    
# Roto Node Name Here
node = nuke.toNode('Roto Node Name')

# Target Roto Shape Name
shapeName = 'layer/shape'

# Target Tracker Name Here
tNode = nuke.toNode('Tracker3')
k = tNode['tracks']

numColumns = 31
colTrackX = 2
colTrackY = 3
trackIdx = 0 # for the first track


first = nuke.Root()['first_frame'].getValue()
last =  nuke.Root()['last_frame'].getValue() + 1

for frame in range(int(first), int(last)):
    nuke.activeViewer().frameControl(frame)
    center = shapeCenter(node, shapeName, frame)
    tNode['translate'].setAnimated()
    k.setValueAt(center[0], frame, numColumns*trackIdx + colTrackX)
    k.setValueAt(center[1], frame, numColumns*trackIdx + colTrackY)