Boomerang streaming captures

[monks19]

Hi. I'm looking for a way to capture successfully videos from the Boomerang streaming website. I tried both ReplayMedia Catcher and Internet download Manager unsuccessfully, Does anybody here know how to do this ?

Here's a link for exemple: https://watch.boomerang.com/watch/1/1 (be careful, only accessible from the USA only. I had to use a VPN to access it).

Thanks to answer