Google promised at Google I/O that Daydream VR was getting Chromecast streaming support later in the year with the arrival of Daydream 2.0. But it looks like Samsung and Oculus one-upped Google and brought Chromecast streaming support to the Gear VR. The newest version of the Oculus app will now show a Cast button at the top right corner. When you tap on that, it’ll ask you to select the Chromecast-enabled device you want to stream to.
Source: Droid Life