Yea the stream plugin doesnt seem to work from the quickbox installation, but there's an easy way around it for streaming with VLC player. This is how:
Go to your Quickbox dashboard, and to the left under ruTorrent, deluge or if you have more apps installed, there is a button says Downloads, and choose rutorrent if the video you want to stream has been downloaded with it.
Then you come to a index page of your download folder, go to the file you want to stream and right click -> copy link adress. Then in VLC, go to Media in the upper menu and choose Open networkstream, paste the url adress and Play. You will have to write the login details before the video will be played (same as you have to the dashboard).
Hope it helped