The joy of silent running – the agony of creaks and clicks!
Hard to diagnose from a video but it could be any one of the following:
loose chain ring bolts
loose suspension bearing bolts (beware torque settings!)
grit on the inside of the seat tube where the seat post is inserted
pedal bearings
bottom bracket is loose or needs replacing due to worn bearings
crack in the frame (hopefully you would have noticed this)
or my particular favourite that confounded me for the longest time….
grit in the retention springs on my SPD pedals (solved only by a clean with an old toothbrush followed by a coating of loctite to effectively insulate the springs from dirt ingest).
It may be something else entirely (that’s my disclaimer in case it’s none of the above)