[Route("api/[controller]")]
    [ApiController]
    public class VideoController : ControllerBase
    {

        [HttpGet("{filename}")]
        public async Task<FileStreamResult> VideoMP4(string filename)
        {
            return await Task.Run(()=> {
                var provider = new PhysicalFileProvider(Directory.GetCurrentDirectory());
                Stream stream;
                try
                {
                    stream = provider.GetFileInfo(filename).CreateReadStream();
                }
                catch
                {
                    provider.Dispose();
                    stream = new MemoryStream();
                    Response.StatusCode = StatusCodes.Status404NotFound;
                    return File(stream, "video/mp4", true);
                }
                provider.Dispose();
                return File(stream, "video/mp4", true);
            });

        }
    }