This whole tutorial has been made by me with such an effort I can bet upon. Such things when you hardly prepare for something but the effort is worthless makes me feel bad.
Please provide me a link which can prove the same post has been implemented before.
Sorry I didn´t put a link here. In this link you have tutorials on OpenTok well documented.
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The link you gave just explains how to add the particular feature but does not provide full support to make a Video chat the one i have implemented. But keeping it in mind, i will try to make some unique things that you people would like.