Is it possible to develop a qml player just like the flash player?
Is it possible to develop a qml player just like flash player, so we can play qml apps directly via a web browser?
Yes, and this has already been done, to some degree. I think there were a couple of projects aimed at that. Try searching for "Qt NaCl":http://qt-project.org/wiki/Qt_for_Google_Native_Client, for example.