To enable video calls, install the following packages. Transport level security: - gst-plugins-srtp - gst-plugins-dtls Peer to peer connection reliability: - gst-plugins-libnice Video output into a window: - gst-plugins-gtk At least one codec is needed in common with the other end of the call, as they are negotiated when the call begins. Video codecs: - gst-plugins-x264 - gst-plugins-vpx Audio codecs: - gst-plugins-good - gst-plugins-speex - gst-plugins-opus