I presume you are referring to 'Live Feed'?
If so, that usually means either a multicamera filming with switching capability, or simply means that you are required to feed the video signal from your camera to a display or projector.
Equipment you'll need will definitely depends on the requirements.
Normally we have 3 cameras, live-switched to master recorder, projector &/or web streaming output. Like in major broadcast events, some may even request for our wireless microwave camera system for 'free-roving' camera.