I did use the instructions on the HA site Blink - Home Assistant
It is all done in the HA congif and automation
I’ve set up a media_dir in my configuration.yaml to get the system access to save files on my setup.
media_dirs: media: /media blink_videos: /share
And then I have automations for each of my cameras to Save Video — FYI Garage Camera is what I have the device named in my HA setup. (Your Miles May Vary as it took trial and error to get this to work).
service: blink.save_video data: name: Garage Camera filename: >- /share/blink/videos/blink_video_garage_{{ now().strftime('%Y%m%d_%H%M%S') }}.mp4