libnice: add new package
v4l-utils: add new package
gst1-plugins-good: depend on v4l-utils

Only if the v4l2 plugins are needed.
qt5webkit: new option for WebRTC build
gst1-rpicamsrc: new package

This is a GStreamer video source element for the RPi webcam.
rpi-userland: new option to install tools to target

In some cases the userland programs such as raspivid can be useful.
libsrtp: add new package
gst1-plugins-bad: SRTP support