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Obviously this only applies to the final, edited video, not the original one you filmed.
Space is a very important consideration. Though you should be filming at the highest quality your camera and storage space allows - that will be too much for real-time video on the web. Assume a client download speed of 300kbps300kBps, and calculate how much space that means your video can take, based on how long it is.
You don't want to have bad quality though. So you should have a native size at least 640 pixels wide and make sure you can clearly see the speaker's face.