Add vertical slider control for rapid change in zoom magnification, which opens after clicking a zoom icon on the lower left side, next to the volume. e.g., one of these-
https://mui.com/material-ui/material-icons/?query=zoom
Double click zoom control icon could reset the zoom and translation.
Support pinch zoom and translation (multi-touch) gestures on primary video. See http://devdoc.net/web/developer.mozilla.org/en-US/docs/Web/API/Pointer_events/Pinch_zoom_gestures.html
Add vertical slider control for rapid change in zoom magnification, which opens after clicking a zoom icon on the lower left side, next to the volume. e.g., one of these- https://mui.com/material-ui/material-icons/?query=zoom
Double click zoom control icon could reset the zoom and translation.