A converter won't be able to be used for .kml (some can but it wouldn't really work) so you'll have to use a Video Capture Software. There's a few that are free. One would be Debut Video Capture. It's free but there's a better version which has to be bought, so if you want an even more advanced one then you can buy it.
Anyways Debut Video Capture can:
Capture video directly to your hard drive.
Record video in many different file formats including .avi, .wmv, .flv, .asf .mpg, .3gp, .mp4, .mov and more.
Record from your webcam, screen or video input device (eg. VHS recorder).
Record almost anything - anything you can see on your monitor can be recorded.
Record video and audio simultaneously.
Create photo snap-shots at any time.
Add your own text captions or time stamp your video.
Change colour settings and video effects before recording.
Adjust the video resolution, size and frame rate for capture.
Ability to burn directly to DVD with Express Burn DVD Recorder.
Works with BroadCam Streaming Video Server to stream over the internet.
Here's the link for the download and more information.
http://www.nchsoftware.com/capture/index.html
Hope I helped. :D