feat: video clipping

[AlenVelocity]

fixes https://github.com/imputnet/cobalt/issues/375

didn't se an open PR on the issue. Please close if this is already being worked on or not planned atm

demo:

https://github.com/user-attachments/assets/4fecb846-1ad0-4395-bf1c-7410ca07afe4

marked as draft because the way it's done rn is highly inefficient and parts like local processing and the UI needs more work