check out the shareware version of captureIt for OS X
I’m not sure if anyone else agrees with me, but I have noticed these days that the video quality of many apps - such as trailer videos or gameplay videos - seem to be of a higher standard and quality. There are some really professional looking videos to promote the app/game in question, it is quite impressive!
Mines in comparison, albeit as a first timer and without the specialised software, look a little amateur-ish and poor…