Firstly, W3C does not provide a standard for adaptive bitrate streaming, yet. So for the time being most browsers only support simple progressive download playback. Hence, there is no JS implementation of a Smooth Streaming player and Microsoft is not working on one, as far as I know.
The example you provide uses the "Microsoft Smooth Streaming Client SDK Beta 2 for Windows 8" which is a C++ library and is only available for Windows Store Apps development. It has nothing to do with browsers.
So, unfortunately this is not yet possible. Even more, I doubt that this will ever happen, because everybody is waiting for MPEG DASH to be finalized.
UPDATE. Please, notice that you always can use Siverlight application for playing SmoothStreaming. The referenced HTML5 Player framework is capable of falling back to Silverlight.