Hello @AtrashDingDong,
It works here with:
Processing 4.3
https://processing.org/
GStreamer 1.24.3 < I could see the virtual cams in the Capture.list() once I installed this!
https://gstreamer.freedesktop.org/
OBS Studio 30.1.2 (64 bit) < Comes with a virtual camera!
https://obsproject.com/
OBS VirtualCam 2.0.5 < This is NOT needed! Here for reference only.
OBS Virtualcam | OBS Forums
NOTE: There is a note on the link above that recommends another solution which also worked:
Virtual Cam Filter | OBS Forums
:)