Serge- This might be a long shot. but my '99 3.8 had a similar sound at about 76,000, but the sound would come and go and not be continuous. In my case a very weird thing happened: The plastic cage that holds the roller rockers and keeps them from rotating broke off on one end. This let the roller rockers spin around in a circle, and when they (2 of them) did this the roller no longer rolled on the cam. So it was non-rolling metal rubbing on the cam. You can imagine the sound it made. But I say again, the noise would start and stop depending if the rockers were rolling on the cam or just rubbing. Again, when they did make noise it sounded just like your noise. Cost about $2,300 for a shop to repair it.
I noticed toward the tail end of your video that the noise seems to indicate two separate, but similar sounds - just like my noise since two roller rockers were involved.
Something to consider?