TCamera (Teachers' Camera) lets you use your mobile phone as a document camera. It is super easy to set up your android smart phone as an additional camera using TCamera. You can stream the content captured from your phone camera to your laptop. You can then share this video stream in Google Meet, Zoom, Microsoft Teams and other meeting web apps for giving presentation to your audience. It can also be used to conduct exams / interviews remotely.
With TCamera, there is no need for you to purchase expensive document camera. Just this simple app and you are good to go!