Long before Green Screen by OBS became standard, ManyCam 4.1.2 offered a 4-layer video mixer. You could run a webcam on Layer 1, a video file on Layer 2, a slideshow on Layer 3, and a lower-third title on Layer 4—all composited in real-time.
A math tutor uses ManyCam 4.1.2 to switch between a writing tablet source, a PDF slide, and their face. Because 4.1.2 supports Region of Interest zoom, they can pan across a worksheet without moving the physical camera. Manycam 4.1.2
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