Select a camera. > Views menu > Match Camera to View
Match Camera to View moves a selected camera so that its view matches that of the active Perspective view. This is handy if youÆve been framing a shot in a perspective view, but need the view animated. You canÆt animate a perspective viewport, but you can animate a camera view by animating the camera.
Match Camera to View is available only when the current viewport is some form of perspective view, and a camera is the selected object. If you match a camera to another camera's view, the two cameras occupy the same location in the scene.
Procedure
To match a camera to a viewport:
Select a camera in any viewport.
Activate a Perspective, Spotlight, or other Camera viewport.
Choose Views menu > Match Camera to View.
The selected camera (and target) are moved to match the active viewport.
Choose a viewport and assign it to the selected camera.