What is the best way to record a video with augmented reality

Question

What is the best way to record a video with augmented reality? (adding text, images logo to frames from iPhone/iPad camera)

Previously I was trying to figure out how

Answer 1

now I answer my own question

the best would be to use Objective-C++ class (.mm) where we can use OpenCV and easily/fast convert from CMSampleBuffer to cv::Mat and back to CMSampleBuffer after processing

we can easily call Objective-C++ functions from Swift