Add GIF watermark on a video in iOS

Question

I need to accomplish this function: There is a GIF overlay on a video, hoping to composition this video and GIF to a new video. I\'m using the following code, but result is only

Answer 1

Just in case here's the example on swift3 how to do the same - insert animated frames/images into the video (not exactly the gif but array of Images). It uses AVAssetExportSession and AVMutableVideoComposition together with AVMutableVideoCompositionInstruction, and CAKeyframeAnimation to animate the frames.