You may wonder why in the world you would want to use your phone as a webcam much less wirelessly? However, the truth of the matter is if you have a recent smartphone with a nice camera then you do not need to buy a webcam. You can use your webcam for an HD look and gain some flexibility with your phone.
By using an app, namely EpocCam, you can use your phone via wifi aka wirelessly or connected via a USB cable. While I have used both, I prefer the wireless option so that I can position my phone anywhere that I like without the hassle of wires.
It goes without saying that the included cameras on most laptops or built-in computers like an iMac are "okay". They're not great but they will work. When you want to "level-up" for view, you could purchase an HD camera or use your existing smartphone.
I have used this in a Zoom meeting and I've tested it when livestreaming using Ecamm Live for Mac. However, if I'm going to live stream, I will connect my USB to my computer or to a power outlet so that it can continue to charge during the broadcast.