He could just be very shy or he may not be able to video chat due to not having a webcam. I'd just ask him to send you a recorded video of him saying something like on his phone or something that way you know who your dealing with.
Well that is a very possible that may be happening, as many many people on the net know that they can be anyone they want without a worry of being found out.. to me this practice is very low and very stupid to do to people.. I am 100 per cent male, very honest., and would never deceive no female even on the net.. I will if we hit it off tell her all about me.. including what I wear and why I wear them.. it is a part of my life for one thing..(no reason to hide that fact).. and two I do not like lying.. or being lied too