要實現視頻的濾鏡效果，可以使用DirectShow的視頻處理濾鏡。以下是一個簡單的示例代碼，展示如何在C#中使用DirectShow實現視頻的濾鏡效果：

using DirectShowLib;
using DirectShowLib.DES;
using System;

namespace VideoFilter
{
    class Program
    {
        static void Main(string[] args)
        {
            // 創建FilterGraph對象
            IFilterGraph2 filterGraph = new FilterGraph() as IFilterGraph2;

            // 創建CaptureGraphBuilder2對象
            ICaptureGraphBuilder2 captureGraphBuilder = new CaptureGraphBuilder2() as ICaptureGraphBuilder2;

            // 設置FilterGraph對象
            captureGraphBuilder.SetFiltergraph(filterGraph);

            // 創建視頻源Filter
            IBaseFilter videoSourceFilter = null;
            Guid videoSourceGuid = new Guid("{C1F400A4-3F08-11D3-9F0B-006008039E37}");
            filterGraph.AddSourceFilterForMoniker(videoSourceGuid, null, "Video Source", out videoSourceFilter);

            // 創建視頻渲染Filter
            IBaseFilter videoRendererFilter = null;
            Guid videoRendererGuid = new Guid("{B87BEB7B-8D29-423F-AE4D-6582C10175AC}");
            videoRendererFilter = Activator.CreateInstance(Type.GetTypeFromCLSID(videoRendererGuid)) as IBaseFilter;

            // 添加視頻Filter到FilterGraph
            filterGraph.AddFilter(videoRendererFilter, "Video Renderer");

            // 連接視頻源Filter和視頻渲染Filter
            IPin sourcePin = DsFindPin.ByDirection(videoSourceFilter, PinDirection.Output, 0);
            IPin rendererPin = DsFindPin.ByDirection(videoRendererFilter, PinDirection.Input, 0);
            filterGraph.Connect(sourcePin, rendererPin);

            // 設置視頻濾鏡效果
            // 創建視頻濾鏡效果Filter
            IBaseFilter videoFilterFilter = null;
            Guid videoFilterGuid = new Guid("YOUR_VIDEO_FILTER_GUID_HERE");
            videoFilterFilter = Activator.CreateInstance(Type.GetTypeFromCLSID(videoFilterGuid)) as IBaseFilter;

            // 添加視頻濾鏡效果Filter到FilterGraph
            filterGraph.AddFilter(videoFilterFilter, "Video Filter");

            // 創建濾鏡效果的輸出Pin
            IPin filterPin = DsFindPin.ByDirection(videoFilterFilter, PinDirection.Output, 0);

            // 連接濾鏡效果Filter和視頻渲染Filter
            filterGraph.Connect(filterPin, rendererPin);

            // 運行FilterGraph
            IMediaControl mediaControl = filterGraph as IMediaControl;
            mediaControl.Run();

            Console.WriteLine("Press any key to stop playback.");
            Console.ReadKey();

            // 停止FilterGraph
            mediaControl.Stop();
        }
    }
}

在上面的示例中，我們創建了一個FilterGraph對象，然后創建了視頻源Filter和視頻渲染Filter。接著我們創建了一個自定義的視頻濾鏡效果Filter，并將其添加到FilterGraph中。最后，我們連接了視頻源Filter、視頻渲染Filter和視頻濾鏡效果Filter，然后運行FilterGraph來播放視頻。

請注意，你需要替換示例代碼中的"YOUR_VIDEO_FILTER_GUID_HERE"為你實際使用的視頻濾鏡效果的GUID。另外，你還需要添加DirectShow的引用和導入DirectShow的命名空間。

希望這個示例對你有所幫助！