If using Quilt, use QSL/QFAPI; if using Fabric, use FAPI; or if using (neo)Forge, use Sinytra Connector + Forgified FAPI.

About

Green Screen gives you red, green and blue chromakey blocks for use in taking screenshots of what's in front of said blocks or for video production.

The chromakey blocks can be crafted with 4 red/green/blue dye to get the corresponding block.

Chromakey block demo: