If you right click on the imgur link and then click “copy video link”, you can make the link more direct. You can use that to embed the video in the body text with 
which will look like
Alt National Park Service’s estimate:
https://bsky.app/profile/altnps.bsky.social/post/3lrmce3muts2c
EDIT: also organizers within 50501 estimate at >11 million (50501 is one of the groups involved in the No Kings protests) https://bsky.app/profile/50501movement.bsky.social/post/3lrmozcmqx223