Yes and it will keep getting better! They've recorded audio as well as video of the descent from multiple cameras on both the rover and descent stage looking up and down at each other, the ground, and the parachute.
If you read the Nasa press release where this image was taken from it does mention this is a frame from a video taken during descent.
> This high-resolution still image is part of a video taken by several cameras as NASA’s Perseverance rover touched down on Mars on Feb. 18, 2021.
Nope. HiRISE is designed for very high resolution still images, not video.
This isn't about the HiRISE picture. It is indeed a still from a video (that was apparently still in the process of being downloaded at the time this was posted).
Only one slow seeder for such a popular video. At least they have all the chunks.