Tell me how to add this effect to the video.

[Рамиль5C82]

Tell me how to add this effect to the video.

How do I replace the black effect?

[Richard M Knight · Accepted solution]

Put your centre main video on V2, duplicate the same video and put it on V1. On that V1 version using the motion controls increase the 'scale' until the video fills the black area. Then add the Gausian Blur video effect and adjust the blurriness to the value you like.