How to blur the background border in vertical video?

First, open the software and import the background (the resolution is set at the gear position in the upper right corner, and the vertical screen is generally 9: 16).

Then click the special effects button at the bottom of the picture to find the fuzzy special effects, and click it to apply.

You can also edit the special effects carefully.

In this way, the background will be blurred, and then click Add Video Material to adjust the position and size of the video with transform pairs.

I use video peas, I hope I can help you.