Pan Camera Movement

A pan is a horizontal camera movement in which the camera moves left and right about a central axis. This is a swivelling movement, i.e. mounted in a fixed location on a tripod or shoulder, rather than a dolly-like movement in which the entire mounting system moves.

A director may use this to emphasise a point to the audience, in this case that the Avengers have truly assembled for the first time to work as a team.