How to find overlap area between two ksdensity plots?

Hi all,

I have generated some ksdensity plots of some vectors. I want to find the amount of overlap between the ksdensity plots of the same features belonging to different classes. My code for plot generation looks like this:

plot_ksdensity(vector1);%vector1 is a feature of class A
hold on;
plot_ksdensity(vector2,'r');%vector2 is the same feature of class B
hold off;

The plot_ksdensity function just plots the ksdensity retaining the original point values of the vectors This code generates two pdfs that overlap. I want to find the area of the overlap. Can someone help me with this?