There are list of frames displayed at the bottom of the screen when videos are played on Photos app in iPhone. Which API is used for this functionality in iOS photo app. Is it possible to check this ?
File Strip Functionality In Photos App
The scrubber UI is available indirectly as API via QuickLook's QLPreviewController. If you preview videos, you should see the same scrubber that is used in the Photos app. If you only want the scrubber and not the complete preview, it isn't available as a standalone UI element. However, you could probably construct something similar with a collection view that uses AVAssetImageGenerator to generate thumbnails at regular time intervals along the strip
Is there any way of extracting P-frames in film strip?