I have very expensive webcam that outputs only through its own usb cable. I need to connect this cam to my video mixer, which accepts only HDMI or composite video. Is there an adapter available to allow me to connect this USB cable to an HDMI port?
the connector that plugs into your video camera what type is it can you take a picture and post it
what your looking for is a USB to HDMI but 99% of those are male USB to female HDMI converters (using male-male HDMI on that end is no issue)
but the end that plugs into your video cam is what we need to address.
Are you sure your webcam is USB? Can you post model / make?
If your camera is USB only - what you need is more or less a computer, where you will plug the camera, and feed your mixed with HDMI output. If you are lucky, some of these under-$100 TV Sticks (complete PC pluggable directly into the TV) might work, with proper software.