save webcam captured image into local folder without using FileSavePicker

I am using Below Code to save image but it save image after filesavepicker save image but I want to save image direct into local folder without using filesavepicker,Please suggest me any Solution for this, thanks in Advance.

webcam private async Task SavePhoto(IRandomAccessStream mediaStream)
 {

   FileSavePicker photoSavePicker = new FileSavePicker();
   photoSavePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;                              
   var mediaFile = await photoSavePicker.PickSaveFileAsync();
   await SaveStreamToFileAsync(mediaStream, mediaFile);

}

I want to save this stream data in image format direct to local folder without using filesavepicker.

Create the StorageFile inside the app's LocalData. Then pass this StorageFile to your function.

StorageFolder dirLocal = Windows.Storage.ApplicationData.Current.LocalFolder;
StorageFile  mediaFile = await dirLocal.CreateFileAsync("mediaFile.abc");
SaveStreamToFileAsync(mediaStream, mediaFile);