Having circle and rounded rectangle masks for video tracks would be very helpful when you don't want to use a full image or green screen cutout, but still want to include the speaker. Hypothetically, the effect could just be a square to start, but with a roundness slider that, at 100, is a perfect circle. Options for this effect could include: Mask X/Y Placement, Mask X/Y Dimensions, Stroke Color, Stroke Weight (0=No stroke), Drop Shadow, Option for Green Screening subject in mask and replacing the background within the confines of the mask (either with a selectable color or image), and a dropdown that would include pre-built masks.