tracking shot

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A movie shot made by a camera moving steadily on a track or dolly.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun cinematography, film In filmmaking, a continuously recorded segment containing no edits, in which the camera is moved (often mounted on a dolly rolling on tracks) so as to sweep through an extensive area or to follow the physical movement of characters or events.