Missing attributes in Video Effects panel (CS6)

Hi! I am new to editing and I face this problem in my video:

When I apply an Effect to the video (i.e. Gaussian Blur), then in the Video Effects panel I cannot see all the attributes. For example I would like to be able to select only selected parts of my video (to blur some faces), and there is no such attribute in the panel to select. (I have seen in videos in youtube that there are more attributes available). Can anyone help? Thank you