'**SUMMARY**
Get the center of the bounding box
**RETURNS**
* *tuple* - center of the bounding box (x, y)
**EXAMPLE**
>>> track = Track(img, bb)
>>> cen = track.getCenter()'

def getCenter(self):

    return ((self.bb_x + (self.w / 2)), (self.bb_y + (self.h / 2)))
