Provide GStreamer source to record VM display

Submitted by Christophe Fergau Fergau @teuf

Assigned to Spice Bug List

Link to original bug (#101830)

Description

This would require multi-client support in spice-server too, but it would be nice to have a GStreamer source which can connect through SPICE, and then feed the audio/video in a GStreamer pipeline for further processing.