There were no large pieces of debris readily visible in the footage.

ref: https://www.reuters.com/business/aerospace-defense/us-air-fo...

    An Air Force B-52 Stratofress carrying eight people
    on a routine test mission crashed today shortly after
    take-off at 11:20 a.m. (PDT). Initial indications are
    that the crash was not survivable. Emergency response
    personnel are on scene, and officials are working to
    account for all personnel.

ref:https://pbs.twimg.com/media/HK40xIqacAAMa3n.jpg

Edwards: https://xcancel.com/EdwardsAFB

Tragic. Most of the crew onboard were almost certainly aerospace engineers tasked with collecting sensor data.

Some more discussion: https://news.ycombinator.com/item?id=48546306

All 8 crew members on board confirmed dead :(