I teach ESL at a community college, and I have often structured exams this way:

1. I create a separate module for the exam. The first item is a page which explains the exam. "Your exam will have two parts. For Part A, you will take a quiz. For Part B, you will submit a video recording....."

2. Structure your exam to have Part A (Quiz) and Part B ( Assignment). Don't try to combine them. Your students will easily figure this out.

3. Assuming that you have Assignment Groups set up, put Part A (Quiz) and Part B (Assignment) into one Assignment Group.

4. Pay attention to the number of points given for each item. Do you want them counted equally or is one part more important than the other?

Your students will easily understand that your exam has two parts. This is a much simpler approach than trying to combine them.