is any subscription fee for Flipkart video streaming service
No,, Flipkart is Totally free. But it does not have dedicated app.
To get access to the video service, you need to update to the latest version of the Flipkart app which is version 6.17. Just head over to the Google Play Store, and update the app. Once you have got the latest update, open the app and hit the menu section on the top left and you should see the new Video option. The first time you open the section, you will be asked to pick at least three videos from a list so that the app can offer personalised and curated catalogue of movies and TV shows.