I have filmed three BJJ competitions for my team so far. I find it more rewarding and much simpler than taking photos. I have used a smartphone as a camera and a tripod for smooth panning. For the tripod, I have used either two-way fluid head (video head) or three-way pan head.
I have thought about filming with DSLR but I would need expensive and 28-70 mm light lens which I do not have and the complexity of the whole filming process would also increase.
With iPhone SE3 I have started using digital zoom more than I used before. iPhone 3x digital zoom is basically 28-70mm equivalent which I have found sufficient in both ends. I would like to try a smartphone with optical zoom for filming BJJ but there are currently only a few models available at the higher price range.
I join all the videos in the command line using ffmpeg without any editing. The result I upload to youtube and add timestamps for convenient watching. All the data that I need for timestamps I usually find from Smoothcomp.