I need to include a video in captivate and from what I can
see, it starts playing when I reach that particular slide. Will I
be able to give users better control on the video, for example, a
start/pause button, a replay button?
Assuming you are referring to a Flash Video here? If so,
there are settings for Flash Video that offer a "Skin" (playback
control). When you use a skin, normally the video is paused until
your user clicks the Play button.
If you are referring instead to a Full Motion clip, you could
use a Button or Click Box object to pause the slide.