Do I need a video capture card to live-stream a dance performance using OBS?

Thank you for your insight!

I believe we plan to use our Canon 5D Mark IV, Mac laptops with the Canon Webcam Utility to enable the camera, into OBS, and out via ZOOM.
I am trying to understand if it is best to include a video capture card or if it is needed. It seems like OBS negates the need for it, but I'm uncertain.