Hi,
the GearVR devices have already direct WebVR support, that means they can be used directly.
Just use a VR browser and open the page-url there.
The best VR browser at the moment is the Oculus Browser, but Samsung VR and Firefox Reality should work too.
You can view the tour on the web page in the Samusung browser and rotate with the GVR pointer but for some reason it all messes up when you click on the Enter VR button.
That's because in the Samsung Internet VR browser the WebVR support is disabled by default and need to be enabled manually in the 'Labs' menu - see here:
https://webvr.rocks/samsung_internet
Best regards,
Klaus