This is a Python Tag called Stage Manager. It let’s you set active ‘stage’ camera with timeline markers. Just give a same name for your marker as your camera and Stage Manager takes care of the rest. There are two different modes: Directive and Strict. Directive mode is designed for markers without range and strict is for markers with custom lengths. If there are no suitable camera found, then the dump camera is used if linked.
ar_stage_manager.c4d v1.0.1 (2023)