Go to eporner.
Com on the deovr media player browser!!
(actually good site for free no login with 4k vr videos!) find the video you want to watch, then click on it and you should see a little.
I watch vr videos all the time on eporner, pornhub, etc just using the built in meta browser.
I tried going to naughtyamerica, badoink wankzvr and czechvr, using the browser function in heresphere and.