Image/Text overlay in video swift

Question

I am work with image overlay for watermark effect in video using swift.I am using AVFoundation for this but somehow I am not succeed.

Following is my code

Answer 1

The code provided by @El Captain would work. It's only missing:

    assetExport.videoComposition = layercomposition

You can add this right after the instantiation of the AVAssetExportSession

NOTE: The code originally provided would only export the video track but not the audio track. If you need the audio track you could add something like this after you configure the compositionvideoTrack:

let compositionAudioTrack:AVMutableCompositionTrack = composition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID())
    for audioTrack in audioTracks {
        try! compositionAudioTrack.insertTimeRange(audioTrack.timeRange, ofTrack: audioTrack, atTime: kCMTimeZero)
    }