'Typically' you will see a fish scratching and rubbing (called flashing) on the substrate, decor, sides of the tank, etc BUT I also have never seen any of my new goldfish do this when they had ich. They acted perfectly normal- swimming, eating, exploring but the telltale spots were very obvious.
In respect to posting a video, I believe you would need to post it first on another site such as UTube or Photobucket first then post the link here.
attached is the video...and before you make a comment. I am removing the rock tonight
Black moor - YouTube