Update: For anyone interested in webcam proctoring for tests and quizzes in online classes, G.A. is sponsoring a webinar on Wednesday March 5, from 1:30 to 3:30 PM. You can sign up at this link.
Have you considered requiring your students to use a proctor to take online exams? The process of proctoring an exam can be difficult and confusing for everyone involved, including the students, faculty, and even the proctors. In an effort to streamline the proctoring process, The University of North Carolina Online website has created The UNC Online Proctoring Network, a website "designed to enhance the academic integrity of online courses by providing students with an easily accessible pool of qualified proctors. These qualified proctors will be available for students who are taking online courses at any of the constituent universities of the University of North Carolina."

Here is the direct link to the UNC Online Proctoring Network website:
http://online.northcarolina.edu/exams/overview.htm