Video_out is not defined when using record_video for testing elg demo

[aveenakottwani]

Exception in thread record:
Traceback (most recent call last):
File "/usr/lib/python3.6/threading.py", line 916, in _bootstrap_inner
self.run()
File "/usr/lib/python3.6/threading.py", line 864, in run
self._target(*self._args, **self._kwargs)
File "", line 126, in _record_frame
if video_out is None:
NameError: name 'video_out' is not defined

Could anyone please help me resolve this error? There is no output demonstration video generated right now