Yes, they are free to use if you give proper credits/attribution in the description.
If you don’t follow the terms of use you will have a chance of getting a copyright strike.
The terms of use can be found in the license attached in the video description. https://creativecommons.org/licenses/by/4.0/
Here are a few examples of how you can credit the creators of Creative Commons-licensed footage:
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In the video itself: Include the title of the footage, the creator’s name, and a link to the original source in the video credits or in the video description.
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In a written work (such as a blog post): Include the title of the footage, the creator’s name, and a link to the original source in a footnote or a separate credits section.
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On social media: Include the title of the footage, the creator’s name, and a link to the original source in the caption or description of the post.
It’s important to note that the specific requirements for crediting the creators of Creative Commons-licensed works may vary depending on the license. Be sure to carefully read the terms of the license and follow the attribution requirements specified in the license.
I don’t own the music in the video unless otherwise stated.