/// <param name="sourcePath">The path to the source video file.</param>
/// <param name="candidate">The details of the short candidate.</param>
/// <param name="destinationPath">The path where the created short will be saved.</param>
/// <param name="buffer">An optional buffer time to include before and after the short segment.</param>
/// <returns>A task that represents the asynchronous operation.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="sourcePath"/> or <paramref name="destinationPath"/> is null or whitespace.</exception>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="candidate"/> is null.</exception>