Thanks for reaching out to the Stock community.
Videos(HD/ 4k) can be purchased on-demand or by using credits from the credit packs. Videos are not included under standard license.
The type of license is mentioned below each asset as shown in the screenshot:
Also, please see the licensing terms and restrictions of Adobe Stock here: Stock Licensing & terms FAQ: Where can I find the terms and licensing information for Adobe Stock?
For more information on credit packs, please see Stock FAQ: What are Credit packs?
Feel free to update this thread in case of any additional questions.