You bet! You can embed the donation Widget or the Goal Bar, or both!
On the donations page where all your donations are listed you can grab the embed codes here:
When you open the code snippet window you'll see two types of code, as shown below. One for for embedding in an html area such as a page or a blog, the snippet is for putting into your theme's template files.
The difference of course is that if you put something in your theme's template files, such as page.liquid, it will appear on every page. Whereas if you use the html embed and just put it on a page in the page editor it will only be on that specific page. Same goes for blog posts.
Here's how you would enter the embed HTML on a page: