How can I apply dynamic data to a video file in Swift?

Question

iOS

Hello! I am making an application to record from the camera. I use AVFoundation for the final file. There are labels on the screen that show dynamic information. How can I make it so that this data is also superimposed on the final video file.

Answer 1

Greetings.
I did this with GPUImage. There is a Blend filter and with its help you can integrate the UI interface into the video.
But it writes in real time.

Answer 2

May I ask you for a code example?