The youtube video you are talking about is the Gordon Highlanders International Beating Retreat. This coincided with The Homecoming Scotland celebrations. Participating bands and contingents came from:

The Highlanders (Seaforth, Gordons, and Camerons) 4th batt. The Royal Regiment of Scotland (Pipes and Drums)
The Gordon Highlanders Association (Drums and Pipes)
Aberdeen Universities Officers' training Corps (Drums and Pipes)
The Toronto Scottish (Queen Elizabeth, The Queen Mother's own (Pipes and Drums)
48th Highlanders of Canada (Pipes and Drums)
Cape Town Highlanders (Drums and Pipes)
5/6 Batt Royal Victoria Regiment (Pipes and Drums)
The London Scottish (Pipes and Drums)

A programme of events was as follows:

July 29, 2008 The Gordon Highlanders Museum Beating Retreat
July 30, 2009 Huntly Mini-tattoo
July 31, 2009 Museum fundraising dinner
August 1, 2009 Aboyne Highland Games
August 2, 2009 Tartan Day Beating Retreat, Aberdeen

The only pipers on parade wearing eagle feathers were the Highlanders. The ONLY Regiment to do so, this was inherited from the Queen's Own Cameron Highlanders. All other pipers wore Blackcocktail feathers. The modern feathers are synthetic, as it is very difficult to get authentic feathers. If you are friendly with a gamekeeper then you may be in luck!