Webcams are sold out everywhere but I much prefer to use my computer instead of my iPhone or iPad for videoconferencing. To solve this problem, I’ve started using https://www.kinoni.com/ to use my old iPhone 7 as a webcam. It’s been collecting dust and now it works great as a 1080p webcam. It took about 10 minutes to get up and running and it was almost plug and play. I would recommend using a USB cable instead of WiFi for a more reliable connection.
I’ve had 0 problems with it but I have heard that it might not work with the newest version of zoom because of their heightened security now that they’ve come under so much scrutiny.