How to make video call from Lenovo K4 Note without using any third party app?

I purchased lenovo k4 note and had a great experience. I used to make video calls in the dialer app but as i updated the os from lollipop to marshmallow, the video calling feature has been dissappeared from the dialer. So please tell me how to make video calls now from my phone without using any third party app..???





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