Adobe Connect: how to display a picture in the WebCam pod when not sharing video

In addition to what Jorma stated- there are certain webcams which have a "privacy shade" feature that will appear on the Camera pod in Adobe Connect (I have one with my Logitech camera).

The WebCam pod can pause a live video showing a static image. However, I believe that you are looking to use a Share pod, where you can upload a JPG or PNG image. Just place the share pod with the image where you would have the Camera pod.