That awesome camera app, as well as the new Gallery we saw from the upcoming Android 4.2 release can now be installed on your Galaxy Nexus running Android 4.1.1.
There’s still a bug in the photosphere portion, but dmmarck, the fellow working in it, says he has some ideas and will continue to look at things for a fix.
Be sure to visit the forum thread for the full instructions, as this one needs a bit of hackery to install.
Source: Android Central forums