automated python algorithm that should use GPU and increase the performance of code

i have a python code which runs fine sometimes but sometimes, I am not happy with the output as its using only GPU its taking so much time so I want it to rewrite it to make it force use GPU. I want it to be divided into two parts 1.clipping the video files 2. mixing the video files with audio. you can see the pravtraxx document to know what s happening in the code. I use jupyter notebook