How do I setup a camera in a fixed position?
Get a camera (not a webcam), any camera, and put it on a tripod. Make sure the camera has the approriate mount to put it on your tripod. If you have a camera without such mount, just prop it up against some books or something like this. Then connect your camera to your PC (for live streaming) or just record to SD card and put it on your computer later (for prerecorded video).