OK what you'll see in this video are a mode 1 and a mode 2 screen of the same subject being captured by the VIDI device and then loaded into the the Advanced OCP Art Studio. Parts of both screens are saved as windows and then rotated.
Links:
https://en.wikipedia.org/wiki/OCP_Art_Studio
https://www.cpcwiki.eu/index.php/The_Advanced_OCP_Art_Studio
https://www.cpcwiki.eu/index.php/Rainbird_(software_house)
Six reviews of VIDI from the CPC press:
https://cpcrulez.fr/hardware-digit-digitaliseur_vidi.htm?t=VQ==
Technical info:
https://www.cpcwiki.eu/index.php/VIDI_digitizer
Not emulated - original hardware and software.
Please note that the aspect ratio for this YouTube video is 16:9 but the CPC monitor
has an aspect ratio of 4:3 so you may wish to adjust your viewing device accordingly.