I have experimented with the ETC through some oldfashioned VJing hardware:
The base picture comes from the ETC (the modes used are similar to those https://patchstorage.com/s_perspective_lines_fa/) . The HDMI signal is converted to composite-video, then fed into a Korg Kaoss Pad Entrancer, then sent through a Edirol V4, and then grabbed with a cheap composite-to-mov converter.
Due to the conversion from HDMI to composite video the resolution is much worse than the HDMI output. But it is not as bad as the video might look like. I used the lowest quality settings for the composite-to-mov converter, to keep the filesize low.