Kdenlive/Manual/Effects/Crop and transform/Pan and Zoom

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Position and Zoom

Adjust size and position of clip using smooth affine transformations. Formerly known as "Pan and Zoom"

In this example we have two keyframes in the pan and zoom, one at the beginning and one at the end. Size is 25% at the start keyframe and 100% at the end. The images are centered on the screen at both keyframes.

See also this tutorial that describes how to use :

Alpha Manipulation>Blue Screen
rotoscoping
Composite Transition
Crop and Transform>Pan and Zoom effect
Enhancement>Sharpen Effect
Alpha Manipulation>Alpha Operations

Tutorial: How to do pan and zoom with Kdenlive video editor - Peter Thomson