I have read this problem about synchronizing few videos on forum. After yet another search I found some tool ....

Anyone have few multicam files to test this Java tool?

https://github.com/JorenSix/SyncSink

Readme says you can drop video files too.

There were other similar tools, python-based .... or open-source but for windows.

https://github.com/align-videos-by-sound/align-videos-by-sound

https://github.com/protyposis/AudioAlign