You can change the resolution of the video, or you can make the portrait smaller.

1 Open the clip and import the video;

2. Click on the picture in picture, add the picture in picture, and select the video to be inserted;

3. Hold the video with two fingers and pull it out to enlarge it, and pull it out to reduce it.

If the whole picture is made small and only people are made small, the simplest thing in ps is to select the portrait with lasso tool, that is, cut the picture open and then make free transformation to reduce the portrait. In this case, you can only drag it to another background, but if you want to put it on the original background, I'm afraid it won't work unless the original background is monochrome.

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