I have created an app does the content will show only if i enable internet on mobile. Can i see it offline.

If the content is included in the app (i.e., if your pictures, graphics, sounds, videos etc are compiled in the app) they will still work when the device does not have internet. If you have URLs for your content, or if your pages need to pull anything from URLs or links, then that of course will not work. I try to compile in as much as I can to ensure "offline" functionality is maximized.

Thank you i got it is there any way to include videos i will purchase plugin later when i get some money.

Yes. You can include videos in your compiled app. But just be careful about how big the app gets. Sometimes it's best to link them. I have an app that has over 500mb of videos, and it still sells fine. But its meant to be a bunch of video resources that are best to be accessed regardless of internet. Just depends on the app, really.

How do i include video in my app. iframe is not working from youtube and video tag doesnt play.

Most types of URL links should work (youtube, etc). If you want to include the video, than just check out the video player plugins. There is still some basic video capability built into the core also, but that may take some extra digging.

I added mp4 video link only sound is playing no video.

embedding the iframe tag that contains the youtube video in the html or php page, then showing the page with the custom url plugin should work. also this plugin is great for screens with one video and also is for android and ios,and will work also offline if you choose to include the video in your app: http://www.buzztouch.com/plugins/plugin.php?pid=3C06F75263AE92A0B802F44