Hadi,
this is just a guess.....sorry I'm no mechanic...
by watching the vid it looks like the only movement that I could see was originating at the wheel bearings....I looked at the rod ends for vertical seperation and I could not see any. I didn't see any other movement like at the 1/2 shaft joints and it didn't look like the rear knuckle was moving either...that only leaves on other thing, the wheel bearings....it looked to me like the clunking noise and the wheel movement were syncronized.
JMH observation
Tom