There is also video of them shooting and killing people trying to enter the capital and video of them actively pushing back and being overwhelmed. Much more than one out of context clip.
I can't find the video of the first, outer cordon falling anymore, but this is the second, inner cordon falling at the beginning of this clip, followed by attempts to stop the protesters on the steps:
https://www.youtube.com/watch?v=6PCHra6JuuQ&t=3s
Then there was desperate fighting over doorways inside the capitol building.