1) Give us an idea what your budget is. $30, or $300, or $3000.
2) Are you planning to record audio on an audio recorder, and video on a separate video recorder, and then sync them in post? Seems like the hard way to do it IMHO.
3) What "noise" are you trying to capture? Most of us focus on capturing the music sound while trying not to capture crowd noise. If that's not your quest, then please explain.
In regards to using the board patch... there are a few bands where the sound guys make an awesome mix intended for recording (Radiators), but that's quite rare. Frequently, especially in small clubs, the board mix is just the "fill in mix" going to PA stacks and recording that alone sounds lifeless by itself. An Audience recording generally captures everything much better, as well as a lot of generally undesireable crowd noise. The best recordings are frequently a "matrix" where the AUD and SBD are recorded to 4 tracks and mixed together afterwards.