Recover audio from file

[ucancallmex]

Hi,

 

I screen recorded a very important conference. 

Unfortunately I did not know that I need to click record audio from speaker.

Now the output video is without audio. It might sound like a dumb question but is there any way I can retrieve the audio from the file.

I mean by any little chance the audio is somehow embedded but suppressed that can be retrieved. 

It is very important to me. Please help. Thanks in advance.