How to display video in a custom GUI without blocking it?

Hello guys, I hope someone can help me here. I am having a few problems trying to play a video in my GUI. The problem is that I want to be able to press some buttons and edits in the GUI, but when I follow the examples with for loops for this task, the GUI blocks the components. How should I solve this?

Right now, I am using VideoFileReader object to read the video file, but the loop with step function doesn't seem to work because of the problem I said.

Thanks in advance,

Juan