I bought Civ 5 and clicked too quickly on the intro video the first time I loaded the game. Now it doesn't play anymore but I would like to see it again. I cannot seem to find where to reset it. I bought the game on Steam and I am on MacOS 10.9 (Mavericks).
You can check in the options under interface options for skip intro checkbar,like this, and make sure it is set as you wish it.
Another way is in the game folder itself,should be "Steam\steamapps\common\Sid Meier's Civilization V".There you can find Civ5_Opening_Movie_en_US.wmv.It is simple movie file you can play.