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To add a Mask Object you can:
You are offered three alternatives
The MASK can be a Preset Template Mask or an Image or Video.
In the Template section choose either Circle or Rectangle for Style.
Size and Width of Blur can be adjusted for a circular mask. If a rectangular mask is chosen the addition Corner Radius is available. Clicking on the button between the Horizontal and Vertical parameters in “Size in Pixels” allows an elliptical / oval mask to be created. Click on OK.
You can now add an image to the Mask Container. The mask allows the portion inside the circle to be seen.
If the Mask Container is added to an Image (as a Child) then the Mask allows you to see through the Parent Image to the image contained in the Mask.
The Size and Appearance of the Mask Container, the Mask and the contained Image can be adjusted per Key Frame.
You can also create a mask in an external editor and use that in place of the Template version.
The “Image Mask” should be “white and black” or or “white and transparent”.
In the example below a white diamond shaped transparent png has been used.
See "Create a Simple Pan" for an example of basic Key Frames.