"BMW technician describes how to open the doors if the battery dies and the proper way to open the hood."
While opening the doors of the BMW i8 without battery power seems somewhat difficult, opening the hood (with or without power) is darn near impossible.
BMW engineers clearly don't want i8 owners tinkering under the hood, so the process to open it is so complex that it requires two people, including one BMW tech.
As the BMW tech notes, the hood is so fragile that extreme care must be taken when attempting to open and close it. Or, as the tech advices, take it into your BMW i certified dealer if you need to look under the hood for some reason. Let the dealer be the one who messes something up.