A recommendation displaying the July crisis in 1914, between Sarajevo assassination and the beginning of the war.
37 Days, BBC miniseries. Anglocentric point of view.
https://en.wikipedia.org/wiki/37_Days_(TV_series)
Also Europas letzter Sommer - Die Julikrise.
Unfortunately cannot understand german and found no english subtitles anywhere. Online link to the video and a pdf.
http://www.br.de/mediathek/video/video/europas-letzter-sommer-100.html#tab=help&jump=tab
http://www.br.de/presse/inhalt/pressedossiers/Doku-Europas-letzter-Sommer100.html