If all you are attempting to do is display the subview in a form, then it would be possible. Included in the rules within K2 Designer is an action that displays a subview. There would also have to be a rule on the subivew to close it when the submit button is pressed, though.

Can you please tell me how can I do it?

First, you will have to design the subview that you want to have pop up. Then, go into  form and make a rule. Set the trigger condition to be what you want (when the button is pressed, when the form is intialized, etc.). Then, under actions select open a subview from the options. You will then have to indicate which view you want to open. Then, go to the subview and configure a rule on the submit button, or however you want to close it, to close the window when it is clicked.