Similar to #6387

System information (version)

• OpenCV => 3.3.1, 3.4.2 and 4.4.0
• Operating System / Platform => Ubuntu 16.04 (under conda)

Detailed description

Steps to reproduce

This is in the python wrapper, but I assume this can be reproduced in C++ easily.

>>> import cv2
>>> KLT_optical_flow = cv2.SparsePyrLKOpticalFlow_create()
>>> KLT_optical_flow.getDefaultName()
'my_object'

The correct out put should be something like SparseOpticalFlow.SparsePyrLKOpticalFlow

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues,
  answers.opencv.org, Stack Overflow, etc and have not found solution
• I updated to latest OpenCV version and the issue is still there