First of all, we save the frame of the first video and the image of the initial frame of the second video in jpg format to plan the transition.
In its simplest form, we use the following prompt. Screenshot below.

smooth transition, high quality
You can watch the video example.
Don't forget to follow them on social media for support!
My personal account: https://www.instagram.com/mesutttisik/
Grand media: https://www.instagram.com/grand.medya/