Get the audio sample buffer from an ofVideoPlayer

I need to manipulate the audio part of a webcam stream which is playing into an instance of an ofVideoPlayer.
The best situation would be to get audio data directly from the audio sample buffer of the player.
After having a look to how ofVideoPlayer is implemented it seems there’s no a straight way to do it. I’m trying to add some code to OF to get this working, but I’m hitting a serious wall.
I wish to spend some time on that, I can work both on macOS Mojave / Windows 10.
Maybe someone could give me an initial advice on the right way to do it?
I mean how to get a pointer to the audio buffer, setup a callback to read the buffer, stuff like that.