So if you have a K6P you will need a mixer to supply the phantom power or I think some Beachtek XLR adapters also supply phantom power. The K6 series belongs to family of electret condenser mics as opposed to Sennheiser MKH416 or the MKH 60, which are true condenser mics. But the K6 series is good value for money because you can add on capsules as and when you want it or can afford it and the sound quality is quite acceptable. There is also a model K6RD with reduced sensitivity especially for camcorders so that they do not pickup the whirring of the tape transport system. Licensing music may be appropriate in some instances.
Video tends to lose information in the highlights, and film in the shadows.
Video gaffing needs to primarily light to those highlights. The same conceptual ideas about the ratios between key, fill, back, rim and set lighting can be applied, but need to be executed differently. I hear most video gaffers bring a very high quality studio monitor to the set, and light to that look. Film gaffing is all about metering and adjusting light levels. In as much as video has been mostly a journalistic medium, a visual record.