Drawing a circle on a video

I have a panel that using direct show I have attached a video feed to using the panel's handle. What is next on my to do list is enable the user to draw a circle on the video and I will center the camera to that center of the circle and zoom in to the size of the circle.

I need help with creating the circle. I attempted to use GDI+ to draw the circle, but when using direct show the video is always on top. I posted this question in the vb.net forum and it was suggested that I use DirectDraw to create the circle. I was hoping someone could show me an easy way to draw a circle using DirectDraw. Or if anyone had a different idea.

Thanks