I wanted a headset with usb connection to the smartphone. It also appears my smartphone almost fits in the samsung gear VR, so I went for it. I found one second hand for around 20$. I had to trim the corners and it worked. Then I had to replace all the inside uncompatible and useless (to me) electronics with a micro usb cable.

Once I have put everything together , it looks like this.

The smartphone sits on the same usb hub as the raspberry pi on the right, all connected to the left one, which acts as the server for everything.