[Feature Request] Show the player and video thumbnail while playing audio only#142

So far when you play a video as audio, `mpv` or `vlc` run in the background, which is fine if you want to consume less CPU or RAM, but imagine you want to pause or go to a certain minute of the video. This becomes impossible as both players do not show their interface. So... How about implementing this option? Besides being configurable as: `audio_player => 1`, `audio_player_thumbnail => 1`, in `GTK` and `CLI`. I attach an image as an example (suppose that the image is the thumbnail of the video and that it plays only the audio):