The mediaplayer does support Widevine DRM in OEMs having hardware support. Please check out the online API documentation http://developer.yahoo.com/connectedtv/kontxapi/#file:core__mediaplayer
I think you can initialize the KONtx.mediaplayer as follows:
KONtx.mediaplayer.initialize({drm:{system:"widevine", bandwidthCheckURL:"http://abc.com/blah"}});
Check other APIs like KONtx.media.WidevinePlaylistEntry and KONtx.media.drm.WidevineOptions related to playlists for widevine.
Thanks,
Vivek