You can download and install this software on your Oculus Rift:
This will give you the option to watch videos and stills on your Oculus. To view a Vuze rendered videos, please rename the file by adding "_TB" to the name (example: "video01_TB.mp4").
You can also learn more from this thread: https://www.reddit.com/r/GearVR/comments/3u8fyb/how_to_play_all_3d_movies_on_the_new_gear_vr/?st=j0z21zny&sh=58500748
To get started with your Oculus Gear VR please check Oculus support webpage here:
To get started with your Oculus Go please check Oculus support webpage here:
Whether or not you should change the file names of your videos depends on the player you are using with your Go HMD.
Some players require you to add "_360_TB" ending to the files so it should look like this: filename_360_TB.mp4