The official Debian vlc version looks to be qt5 based https://packages.debian.org/stretch/vlc.zagreb999 wrote:VLC-GTK style
IS THERE VLC-GTK style
FOR STRTCHDOG 32BIT...?
REGARDS.
If you were looking for a more common look-n-feel then I believe if you add
export QT_STYLE_OVERRIDE=GTK+
to your .profile then that will set qt5 to look more like your gtk3 theme
For qt4 you need to include/add something like
[Qt]
style=GTK+
font="Sans Serif,13,-1,5,50,0,0,0,0,0"
in ~/.config/Trolltech.conf to do similar.