There is a heatmap plugin available and which works quite well.
Good news: we’re working on Heatmap Analytics for Piwik + scrollmap + click map! It will be awesome and make sure to hear when it’s released by signing up here: http://www.heatmap-analytics.com/
We've just released Heatmap + Session Recording for Piwik Analytics!
- Heatmaps show you where on a page your visitors click, move the mouse and how far down they scroll so you can discover which content your visitors actually pay attention to, where your content is confusing, and whether your content is engaging. Based on this information you can improve your content and page structure and ultimately increase your conversions.
- Session Recordings lets you record all clicks, mouse movements, scrolls and form interactions of a visitor so you can replay them in a video. See exactly what your visitors did on your website to truly understand them. Find out where they have problems or get confused to improve usability and conversions.
Comes with 100% data ownership, full control over your data, and no limitations.