The missing package is already here,
but I've preferred to include the bits I use from it in my package, such that there are no dependencies to satisfy. If you try to install this package from Nokia's repository over the web please note that this worked for me only when I've downloaded it and installed with dpkg -i as root (in developer mode).

I think it is simpler that you try to install the version 0.0.2-2, linked in the first post in the thread, now that the dependency on gstreamer-tools is removed; I was able to install the package on a freshly flashed with PR1.2 N950, so I expect that it can be installed on your phone as well.