Thanks; I remember hearing that as one of those feel=good songs of the era, like Mungo Jerry “In the Summertime”, or the Looking Glass song “Brandy”.
Here’s a “video” of my favorite from that era, “Yellow River”, by Christie. It’s really a Tremeloes song doing a session with the writer, Jeff Christie, the excellent bass player/singer
https://www.youtube.com/watch?v=lxu5zyUnVzE
I've been trying to figure out the location of the video you posted with no success. I thought at first it might be the Charles River in Boston area due to the "Harvard" type rowboats going by but it could be the Thames in London also.
Here is another video of the same song which is clearly on the Thames.