The YouTube app has VR capabilities built right into it. I was surprised to find that I could watch every video on YouTube using Google Cardboard. This doesn’t mean that every video is built for virtual reality. Most videos aren’t.
However, there are several channels that are dedicated to 360 videos. One channel that I took a look at is called Virtual Reality. This channel has a plethora of 360 videos to watch. For example, one video took me to several national parks. The video was created by Google, and it had tour guides take me around. Another video they had put me right next to a herd of elephants. Too bad I couldn’t ride them. IGN also has a virtual reality channel called IGN VR. I watched a really cool video that they made on the history of Mario games.
I recommend checking out YouTube in VR. I think it is better than the dedicated VR app Within. The only thing I didn’t like about the app was that I had to remove the phone from Google Cardboard to pick out a new video.
If you want to watch any video in VR select the three dots in the upper right hand corner, then tap the Google Cardboard icon to begin.