In the session player, the events are represented as icons in the Event feed, and dots on the recording timeline.
The Event feed shows every interaction in the session. All events are clickable items..
The Events can also be viewed in the action sidebar:
You can save events directly from the session to the Event manager. Double click on any event, as seen below with the example of the "View Cart" button.
This will allow you to see the total amount of visitors who complete an action.
For more information on setting up events, check out lesson #5 in Smartlook school, Event Tracking with Smartlook