Here is a snap example of using the CSWebCam in order save the camera activity to video file using C#:

CSWebCam-Snap-Example.cs

//Set the video format

_Camera.VideoResolutionX = txtVideoResolutionX.Text;
_Camera.VideoResolutionY = txtVideoResolutionY.Text;

//Set the FPS
_Camera.VideoFPS = "30";

//Set the buffer size
_Camera.BufferSize = "100MB";

//In the MS camera I had to add this 
//in order to display the camera
_Camera.DispWinPixFmt = "yuv420p";

//Set more properties of the 
//destination video
//_Camera.VideoBitrate = "316k";
//_Camera.VideoCodec = "...";
//Audio:
//_Camera.AudioCodec = "...";
//_Camera.AudioBitrate = "128k";
//_Camera.AudioSamplerate = "44100";
//_Camera.AudioChannels = "2";

//Set the ID3 Tags
ID3Tags iD3Tags = new ID3Tags();

iD3Tags.Title = "Title";
iD3Tags.Comment = "Comment";
iD3Tags.Album = "Album";
iD3Tags.Artist = "Artist";
iD3Tags.Date = "2020";

_Camera.SetID3Tags(iD3Tags);

//Set the preview
_Camera.SetPicView(cameraPreviewWF1.Preview);

//Open the device and save the results to a media file
_Camera.OpenDevice(cboCamDevices.Text, cboAudioDevices.Text, saveFileDialog1.FileName);