A “Crab Left” camera movement means for a handheld camera operator to walk sideways (like a crab). The technique is often used to follow a subject that would otherwise leave the frame such as an actor or vehicle in motion.  An example of this is in a behind-the-scenes video of “Grey’s Anatomy) (2006), and is presented in this scene:

http://www.criticalcommons.org/Members/jbutler/clips/greysanatomy20061005qq31_33qqdollyshot.mp4/view

“Zooming” in film-making and television production refers to the technique of changing the focal length of a zoom lens (and hence the angle of view) during a shot. An example of this is in the movie “Ratatouille” (2007).

A “Pan Down Shot” is when you rotate a camera on its vertical or horizontal axis in order to keep a moving person or object in view or allow the film to record a panorama. An example of this is used in the film “Psycho” (1960). In the shower scene in this film, the director has used a pan down shot to show Marion’s death.