TAs have the same grading permissions as instructors. They are able to score polls, class videos, and assignments.
However, TAs have a limited view when it comes to excusing absences. They have access to the Absences page under Grading in the left navigation menu. On the Absences page, they can view make-up work and excuse absences for sections they TA. Note that TAs do not have access to other pages under Grading that faculty can view.