How can be a business starts with 0 capital or else we can say no capital ?

Thank you for your invite. It is not impossible to start business with0 capital with the promoter.

A good idea is always sell able. There are host on investors who are looking to park their funds on a proposition which has good potential to be successful. They are called Angel Investors, google and find out about them around your location. Secondly may have to pitch for crowd funding through a blog, so you can make a blog describing your proposed business its potential and projected profits, a pool of small investors can join in with you to give a kick start your project.

Hope my suggestions help you.  

Business in simple means "Buying & Selling" either way all the organizations in the world is doing the same.

To start with0 capital, you have to sell a product without buying it and once sold you may buy it. through the money you received while selling. This way you can make profit out of it as well as start off without any capital.