Tips for effective color or chroma key shots

chroma key: http://en.wikipedia.org/wiki/Chroma_key

hot spot : a place of more than usual interest, activity, or popularity hot spots>
overdo : to do in excess   "overdo the lighting"
barn door
key in. Computers. to enter (information) into a computer by means of a keyboard.
spill : to let out : divulge 


The tighter the shot, the more realistic the finished look be.
http://www.techcrunch.com/2007/06/15/the-rise-of-the-prosumer/


camcorder: : a small portable combined camera and video recording device


give weight to something

Fig. to attach importance to something. I give a lot of weight to your opinion. Kelly gave no weight at all to the comments by Betty.