The Comeback Special in 1968 had been filmed in front of a live audience, but there were stops and retakes, etc. etc. On July 31st, 1969, at the International Hotel Las Vegas (later the Hilton), Elvis did his first full live show in front of an audience since the Pearl Harbour show in 1961. Tragically, for later generations, it wasn't filmed, but it is reported that the star studded audience nearly lost their minds with excitement. Elvis was in top form as was his band. Incredibly, Elvis' record company didn't bother to record it either, but sent a crew to do some recording a few nights later when the press reviews where sensational. These photos are from the opening night. Elvis is exceptional thin and fit with a look somewhere between Johnny Cash and Shakespeare.
Here is an RCA recording from one of those early Vegas concerts in Summer '69. The video has some clips of Elvis visiting the building site when the hotel was being built and signing the contract to do the concerts on the site, along with some 8mm fan film of one of the shows, which is poor quality but which is treasured by all Elvis fans as a taste of forbidden fruit. Elvis was all about the visuals as much as the music. You can really hear the fantastic energy that Elvis and his band was putting into these shows.