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    <p>Adding a watermark is quite more simple. You just need to use a CALayer and AVVideoCompositionCoreAnimationTool. The code can be just copied and assembled in the same order. I have just tried to insert some comments in between for better understanding.</p> <p>Let's assume you recorded the video already so we are going to create the AVURLAsset first:</p> <pre><code>AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:outputFileURL options:nil]; AVMutableComposition* mixComposition = [AVMutableComposition composition]; AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; AVAssetTrack *clipVideoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; [compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) ofTrack:clipVideoTrack atTime:kCMTimeZero error:nil]; [compositionVideoTrack setPreferredTransform:[[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] preferredTransform]]; </code></pre> <p>With just this code you would be able to export the video but we want to add the layer with the watermark first. Please note that some code may seem redundant but it is necessary for everything to work. </p> <p>First we create the layer with the watermark image:</p> <pre><code>UIImage *myImage = [UIImage imageNamed:@"icon.png"]; CALayer *aLayer = [CALayer layer]; aLayer.contents = (id)myImage.CGImage; aLayer.frame = CGRectMake(5, 25, 57, 57); //Needed for proper display. We are using the app icon (57x57). If you use 0,0 you will not see it aLayer.opacity = 0.65; //Feel free to alter the alpha here </code></pre> <p>If we don't want an image and want text instead:</p> <pre><code>CATextLayer *titleLayer = [CATextLayer layer]; titleLayer.string = @"Text goes here"; titleLayer.font = @"Helvetica"; titleLayer.fontSize = videoSize.height / 6; //?? titleLayer.shadowOpacity = 0.5; titleLayer.alignmentMode = kCAAlignmentCenter; titleLayer.bounds = CGRectMake(0, 0, videoSize.width, videoSize.height / 6); //You may need to adjust this for proper display </code></pre> <p>The following code sorts the layer in proper order:</p> <pre><code>CGSize videoSize = [videoAsset naturalSize]; CALayer *parentLayer = [CALayer layer]; CALayer *videoLayer = [CALayer layer]; parentLayer.frame = CGRectMake(0, 0, videoSize.width, videoSize.height); videoLayer.frame = CGRectMake(0, 0, videoSize.width, videoSize.height); [parentLayer addSublayer:videoLayer]; [parentLayer addSublayer:aLayer]; [parentLayer addSublayer:titleLayer]; //ONLY IF WE ADDED TEXT </code></pre> <p>Now we are creating the composition and add the instructions to insert the layer:</p> <pre><code>AVMutableVideoComposition* videoComp = [[AVMutableVideoComposition videoComposition] retain]; videoComp.renderSize = videoSize; videoComp.frameDuration = CMTimeMake(1, 30); videoComp.animationTool = [AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer]; /// instruction AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction]; instruction.timeRange = CMTimeRangeMake(kCMTimeZero, [mixComposition duration]); AVAssetTrack *videoTrack = [[mixComposition tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; AVMutableVideoCompositionLayerInstruction* layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack]; instruction.layerInstructions = [NSArray arrayWithObject:layerInstruction]; videoComp.instructions = [NSArray arrayWithObject: instruction]; </code></pre> <p>And now we are ready to export:</p> <pre><code>_assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetMediumQuality];//AVAssetExportPresetPassthrough _assetExport.videoComposition = videoComp; NSString* videoName = @"mynewwatermarkedvideo.mov"; NSString *exportPath = [NSTemporaryDirectory() stringByAppendingPathComponent:videoName]; NSURL *exportUrl = [NSURL fileURLWithPath:exportPath]; if ([[NSFileManager defaultManager] fileExistsAtPath:exportPath]) { [[NSFileManager defaultManager] removeItemAtPath:exportPath error:nil]; } _assetExport.outputFileType = AVFileTypeQuickTimeMovie; _assetExport.outputURL = exportUrl; _assetExport.shouldOptimizeForNetworkUse = YES; [strRecordedFilename setString: exportPath]; [_assetExport exportAsynchronouslyWithCompletionHandler: ^(void ) { [_assetExport release]; //YOUR FINALIZATION CODE HERE } ]; [audioAsset release]; [videoAsset release]; </code></pre>
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    1. POiPhone Watermark on recorded Video.
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    1. USJulio Bailon
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    1. COThank you Julio.. I have removed the functionality my app. This code would really help some one. If I am doing this functionality again I will use your code. I will definitely help some one. Thank you very much..
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    2. CONo problem. Happy to be able to help :)
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    3. COOne problem I did find with this method is that it crashes if the app is backgrounded.
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