You can view the heat map from the Pages section in the Creative Analytics report.
To view the heat map
On the home page, hover over the Analytics tab and click Campaigns. The Analytics view appears.
Click the required creative to view the creative's analytics.
Click View Heatmap.
Heat Map is available for select Ad-formats. The list of supported Ad-formats are:
Full Page Interstitial
Currently, Heatmaps are only supported in Canvas 1.0