If you want a template designed for blogging Skye, Tudor, and Foundry are blog focused:
If you are looking for something more visual, Bedford is the most popular template on Squarespace and allows for embedding a video in the banner
You can pull blog posts into the home page on any blog using Summary blocks.
You can see an example on my website here:
Scroll down to New at Menadena and you will see a Summary block pulled from the Blog, which you can also visit directly in the Main Navigation.