I recommend a Zoom aid named FineCam. FineCam works with Unsplash to deliver you millions of stunning video background scenes.
FineCam launch both the iPhone's front and rare cameras at the same time, place the secondary picture frame everywhere, and, best of all, resize it to fit best for your video calls, live demos, streams and more. The biggest difference between FineCam and other similar software is its ability to support the plug-and-play method of using an iPhone as a webcam. Users can flexibly choose multiple angles, take full advantage of the iPhone's compelling 4K/12MP (Telephoto, Wide, Ultra Wide) camera, and high-efficiently remove unwanted background (even dust and hairs on your chair) in real-time.