CoreML on video files

CoreML supports image input / output. You can feed CVPixelBuffer via CoreML API and look up prediction. Here's a good starting point for reading CVPixelBuffer from videos: https://developer.apple.com/documentation/accelerate/reading_from_and_writing_to_core_video_pixel_buffers.

For this, you need to first build a model that takes image and produces a boolean to indicate if there's text in the image. For this, I don't have any specific pointer but, you might be able to find some existing model architectures / trained models that can do this. Once you have a model, you can use CoreML tools to convert that into CoreML format: https://coremltools.readme.io.