We do not recommend any specific brand. Any web cam compatible with the Virtual Classroom works fine.
In the Virtual Classroom we detect and select the web cam attached to your system so that it plays automatically as you enter the class and for attendee it plays when video rights are allowed. However if it does not run you may check the compatibility of your web cam here http://kb.adobe.com/selfservice/viewContent.do?externalId=tn_16453&sliceId=1