When I tested FoxPro code that reads output from a web camera using VideoCapture API, I found that it could read TV tuner's output also. I had ATI TV Wonder Pro card installed at that time.

It was not an ideal solution. For example, I could not find how to switch channels.

Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
http://www.news2news.com/vfp/?example=437