Note: My manual method is not necessary if you get JackDesBwa's scripts to convert 3D Webcams into Anaglyph for OBS STUDIO from GitHub
I downloaded the two scripts which are text files with .lua extensions
In OBS Studio> Tools>Scripts I imported both of the scripts.
The scripts adds two filters in OBS.
SBS Adjust and SBS=>Anaglyph
Choose the 3D webcam Source, add then the two filters.
Make sure SBS Adjust filter is on top followed by SBS=>Anaglyph
Adjust the window for convergence and then the vertical adjustment in SBS Adjust Filter
So easy. Thanks Jack!