slowmo.swift

//TODO: get the 'AVComposition asset' first ;)

let uuid = UUID().uuidString
let exportPath = NSTemporaryDirectory().appendingFormat("\(uuid).mov")
let exportUrl = URL(fileURLWithPath: exportPath)

let exporter = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetHighestQuality)
exporter?.shouldOptimizeForNetworkUse = true
exporter?.outputURL = exportUrl
exporter?.outputFileType = AVFileTypeQuickTimeMovie
exporter?.exportAsynchronously(completionHandler: { 
    if exporter?.status == .completed {
        let url = exporter?.outputURL
        DispatchQueue.main.async {
          //ayy
        }
    }
})