Documents mentioned in the video: Page Targeting for Heatmaps
Solution: In order to track all pages within your site using Heatmaps, you would need to create multiple Heatmaps.
Using the targeting rules "simple" and "exact" are ideal for targeting one page at a time. While targeting rules such as "contains", "starts with" "ends with" and "regular expressions" are for targeting multiple pages that share the same template (for example, product pages or blog posts). With "triggers" you can trigger the Heatmap when a user takes a certain action like clicking a button.
You can find more information about that here: Page Targeting Explained for Heatmaps.