I use a bluetooth headset with VLC when I am using my laptop to listen to music or video streams etc. The headset works when I add
Under the section ‘# ALSA Device Name (string)’ change it
# ALSA Device Name (string) # alsadev=default
# ALSA Device Name (string) # alsadev=default alsadev=bluetooth
Refer to this blog post for setting up bluetooth headset here
Problems I have come across is when you change the Audio device back to ‘default’ through Settings => Preferences => Audio => Output modules => ALSA, you have to do the above method again when you like to use bluetooth headset again.