Luma keying in Premiere Pro is a built-in effect used to remove parts of an image based on brightness levels. It is most effective for isolating subjects against a pure black or pure white background.
Clean Backgrounds: Ensure your black background is "true black" without noise or shadows. luma key premiere pro free download
The effect is included in all standard versions of Premiere Pro and can be found without additional cost: panel (Shift + 7) and navigate to Video Effects Application: Luma keying in Premiere Pro is a built-in
What is Luma Keying?