'**SUMMARY**
Get total number of tracked frames.
**PARAMETERS**
No Parameters required.
**RETURNS**
* *int* * -Number of tracked image frames
**EXAMPLE**
>>> while True:
... img1 = cam.getImage()
... ts = img1.track("camshift", ts1, img, bb)
... img = img1
>>> print ts.trackLength()'

def trackLength(self):

    return len(self)
