With Streamster you are able to zoom in/out your video during the live stream. The most simple way is just to control your web camera zoom during the stream with the mouse wheel. Move your mouse cursor over the area you want to zoom and scroll up or down to zoom in or out.
You can also control the zoom and change its settings in the layer settings. Choose the needed layer, Click the “Zoom” tab to bring your video closer. Also here you can set an option to change the camera resolution to improve the video quality.