@Amiran thank you for calling me.
However, I myself have never applied bottom processing to videos. Here are some common techniques:
https://vr360.work/workflow/adobeaftereffects-360video-bottom-erase/
https://youtu.be/X4BQd6E8iSU?si=5GHQ8-DqFAcGejE8
I often break down a video into frames and perform bottom processing on the still images.
Third-party upload tools such as GoThru often have the ability to perform bottom processing on videos as well as still images.