GG has created a new plugin, called Tracer. It creates an outline (i.e. traces) around an object after a few points are designated. You can then "fill" the alpha channel with its mask, like with a gradient or another object on another track. Although it works well for still images or objects that stay in the same place on a video like a logo, you can also add keyframes.
There is a quick demo at: https://streamable.com/o8bse In the video, you can not see that instead of using the "New" button in the controls menu, I use the right mouse button.
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