If your camera supports external audio sources, you could feed your audio directly into the camera, avoiding the need to sync. Jim Nazium suggested plugging the bass directly into the audio interface, then taking the headphone output of the interface directly into the camera.
Another way to do it would be to mic the bass cab (and possibly another mic for the vocals) and run those into the interface, then take the headphone output from the interface into the camera.
Syncing audio and video in a video editor is not that hard, though. It's a nice easy task to start learning video editing which is a good thing to learn anyway.
Another way to do it would be to mic the bass cab (and possibly another mic for the vocals) and run those into the interface, then take the headphone output from the interface into the camera.
Syncing audio and video in a video editor is not that hard, though. It's a nice easy task to start learning video editing which is a good thing to learn anyway.