You can use velocity chart for scrum boards. Just starts sprint on your board.
The left column for each sprint represents number of story points on start of the sprint. Sum of estimates for task in "queue" and "in progress" columns.
The right column shows amount of completed work. Sum of estimates for tasks in "done" columns .
This charts shows contribution of each member. If a task has more than one member, its estimate will be split between them.
Note: You will see the same charts for the first level children if they are present.