var vtn_player_type = "vp";var ven_video_key="NTY0ODUyfHwxNDcxfHwwfHx8fHx8";var ven_width="660";var ven_height="409";Fans dressed as Transformers, Iron Man and Jedi knights are among thousands at the first day of Hong Kong's comic and games expo. Duration: 00:35