yes it is, it's a bit of a hack. You start splitcam first and set up your camera. Then open obs and add a new video source then choose "splitcam video driver" as the video capture device and now you have both a clean stream on splitcam and you can use plugin on obs.
Another way we can do this is my adding the splitcam preview window as a window capture. Note that by this way the resolution on OBS will suffer.
Let me know if you need any more help.
Regards.