What do you mean by accessing the data? Use a file manager app and look through the various directories to see if you can find related directories. They might be in the /Android directory, or the /data directory.
What app it is would also help with your question. If you mean an app such as Netflix, you will be able to access the data. If it is a different app then like the other poster said you can use a file manager app, such as ES File Explorer, FX file explorer, there are many.
Will check a filemanager. I was always thinking without root it would not be possible. Thnx