I couldn't find a YouTube video of the welcome ceremony of the newly arrived crew of Soyuz TMA-20M.
Was there no broadcast on NASA TV of this event?
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The video of the welcome ceremony for Expedition 47, the crew of the Soyuz TMA-20M, was in fact released publicly. I found one copy of it on Daily Motion:
The footage does contain the hatch opening as well and is a little over 18 minutes long, so you may want to grab some popcorn.