Most vids that are split screen and can move when using a headset are on sites such as, YouTube, Vimeo, and FB. Most content available requires using a platform (FB-Oculus, Daydream/Cardboard - Google+, etc.).
It would be nice to be able to upload a link or a mp4 file to the video gallery page. Striking.ly would have a video player with 360 degree capabilities. This would let visitors to the site use VR capabilities directly through the web browser.