As far as I know, the android emulator come with the packages do not support openGL yet. However, the emulator is extremely slow, much slower than real machine,try it with real machine if you have.
"QtQuick 2 and Android emulator":http://qt-project.org/forums/viewthread/29499
ps : if you know how to get the raw buffer of videoOutput or design your own videoOutput, please lend me a hand, I can't find any useful information about this