Good quality video production is expensive. It takes a lot of expensive equipment, a lot of knowledge and talent and a lot of time to do it well.
In the age of Youtube, experience suggests that a professionally produced BJC DVD cannot be sold for anywhere near enough to cover its costs. However, organisers should consider whether they want there to be a good quality video record of their event. One potential way of 'paying' for it, is to consider it to be a part of the public show performers' payment (ie a video of their performance).
Footage uploaded by random attendees to Youtube is usually of appalling quality.
Musicians have copyright on their music (as used by performers in their acts).
Artists have copyright on their acts.
Videographers may also have copyright on a specific video of an act.
You are not entitled to distribute any copyrighted material on a video without permission from the copyright holder.
Some people won't care less about this, but many performers certainly do, particularly those for whom their act is their livelihood.
If you video an act, get a signed document from the performer, specifying that you have permission to video the act and to use the footage for specific purposes (which you describe).
You may wish to give in return permission for the artist to use your video footage for specific purposes (which you also describe).
The artist may ask for (or you can offer) a concession where you show only short clips rather than the whole consecutive act.
If the artist has an agreement with the copyright holder of the music that would enable you to use that music on your video, get a copy of that agreement.
You may also be wise to get a signed document from the videographer giving you permission to distribute the video.
If you do NOT have permission to use the music, you can find other music which is legal to use and edit that into your video. Look for "royalty free music" or music licensed under Creative Commons licenses.
Past BJC videos
BJC 2013 had Nathan Rae live streaming video of the event on Juggling Live, he also produced a DVD (a percentage of revenue of at BJC sales of the DVD were paid to the event). Nathan raised money for this from a Kickstarter appeal.
BJC 2011 had Nathan Rae live streaming video of the event on Juggling Live, an archive of these videos were also available on Juggling Live. Nathan was paid partly by the event and raised money from adverts.
BJC 2008 felt that a properly edited souvenir video was of enormous value to the organisers personally as a record of their event. Alan Plotkin was offered expenses (air fare from the US) plus a small fee to film the event, but he fell ill at the last minute and was unable to attend. Luc Byard, a very dedicated amateur, spent much of the BJC behind a camera and subsequently produced a few videos. When given the project, Void finished up the job very quickly, and also produced the BJC 2008 DVD. Both of them were paid a token amount for their services. Due to various delays, the DVD was not released until two years after the event. The footage was distributed online only: each "chapter" on JTV and then a DVD ISO that garnered little interest.
BJC 2010 was approached during the event by the local film making club who spent two or three hours filming and promised to produce 10 minutes or so of footage free of charge, since they were filming for their "video magazine" of Huddersfield.
At previous conventions; Howie Bailey made DVDs for BJC Bodmin 2006 and BJC Nottingham 2007; Alan Plotkin made VHS tapes for BJC Norwich 1995, BJC Edinburgh 1996, BJC Nottingham 1997 and BJC York 2000 and made a DVD for BJC Derby 2004.