plz show us the video of this chapter?

Thanks for letting know your concern to us. Your suggestion has been taken into consideration. We keep on adding and updating our animations/videos from time-to-time, based on our users feedback. 

Presently it is not possible for us to provide the videos/animations in this academic session as the process of adding the same is a long one and it will take some time.  So, we advised you for the time being go through the existing study material and write if you encounter any difficulty in understanding the concept.