Hello Bhanu Prakash,
Integrating Microsoft Lync inside a Cordova app would be the same as integrating it in a web application. You will have to use the Unified Communications Web API (UCWA)
. Note, that UCWA is currently available only to customers who have Lync on-premises.
Here is a link to a getting started instructions on how to create an app with UCWA - Create a UCWA Application
I hope this information is helpful. Let me know should you have any other questions.