Well since you don't want to even put your voice in the video maybe you could make some sort of "How to" video where you explain how to do whatever you're providing information about by typing the instructions in a text editor while recording your computer screen. Be warned though, a lot of persons (including myself) do not like such videos, but hey, it does suit your needs. Either that our you get someone else to be on camera or to do the voice acting while you remain behind the scenes as the camera man. You wont have to worry about anyone seeing or hearing you then.