According to the above chromeperf link, the regression range is pretty large R71-11151.123.0 and R72-11316.61.0
Because it's cross milestone, the correct range is between 11152.0.0 and 11316.61.0 (between 2018-10-12 and 2019-01-04)

The range is so large because the test did not run and/or failed all the time.
https://stainless.corp.google.com/search?view=list&first_date=2018-10-01&last_date=2019-01-17&test=video_PlaybackPerf.vp8.1080.60fps&build=R72&board=veyron_minnie&exclude_cts=false&exclude_not_run=false&exclude_non_release=true&exclude_au=true&exclude_acts=true&exclude_retried=true&exclude_non_production=false

p.s. minnie is not tracked by video team alert system