LG's dryers are infamous for this and it's funny what will cause this.......something as simple as a small furball in the blower housing can cause this i've seen it many many times and have fixed it........Look down the lint trap hole and see if you can notice any clogging down the shoot near the blower i've seen 1 fabric softener and a small ball of lint about 4" wide cause the unit to shake like a WWII tank........if you cant' get this debris from the top of the lint trap you have to remove the whole front of the unit to make sure this is completely clean. If that's not the problem remove the drum and realign it and put it back together and see if the noise goes away sometimes it just gets off alignment off the felt or rollers. The rollers are rarely the problem with these models from what i've noticed i used to think it was the rollers originally as well but i'd say maybe 1 out of 100 are the rollers. LG makes their dryer drums super thin to where you can bend the drum with 2 fingers and it's a horrible cheaply made drum. I'm suspecting something trapped in the lint shoot near the blower or you have a bad or warped drum (bad drums will also sound like a train going down the track as far as the noise goes when it's excessive)......Also when reassembling make sure you do not turn the drum in opposite direction of the way it should turn both LG and Samsung if you turn the drum alot of times the belt will pop right off and you have to dismantle the machine and reattach the belt again. Check your warranty paperwork in regards to your drum.

The video shows a pretty loud unit but then again it could just be your audio on your phone or whatever you shoot with. Does it sound like it's brand new?