ConvertMOVtoMP4.swift

  func convertVideoToMP4WithInputURL(inputURL: NSURL, outputURL: NSURL, callback: (error: NSError?) -> ()) {
    
    let asset = AVURLAsset(URL: inputURL)
    let exportSession = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetPassthrough)!
    exportSession.outputURL = outputURL
    exportSession.outputFileType = AVFileTypeMPEG4
    exportSession.exportAsynchronouslyWithCompletionHandler { 
      callback(error: exportSession.error)
    }
  }