Microsoft Stream capabilities vary based on the Office 365 subscription and the below table highlights Microsoft Stream functionality differences by subscription. The Microsoft Stream Plan 2 Add-on is available for Office 365 E1, E3, and E5 subscriptions to enable full Stream Plan 2 functionality.
You can also purchase the Stream License on its own. There are two Plans, Plan 1 is $3/user/month and Plan 2 is $5/user/month. The feature comparison is below: