Expanding circle reveals video clip

Hi,

Is it possible, using Storyline 360, to have a circle with an entrance animation of Grow, and when it grows a video is revealed in the circle (4 sec long). The circle would then have a Shrink exit animation, hiding the vid clip. This is for a popup-style effect.

I am stuck on how to not have the video (square shape) shown except for in the circle. I think some type of layer or mask, but not sure how to go about this.

Thanks!

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