The Detonation build is your typical Magicka Nightblade PvP bomber that lurks around large groups of players in Cyrodiil or Imperial City, most likely in Champion Points enabled campaigns. While certainly you can bomb in no-CP environments including Battlegrounds, it's not really recommended.
And yes while you can also bomb a player and not a group, that is not also recommended unless you really need to get them off your back or maybe they teabagged you earlier.
Beyond the build, it takes considerable patience, getting used to the skills' timings and adaptability to circumstances that may be plagued with lag or high ping spikes during prime time PvP to pull off bombing. To see gameplay or demonstrations of how to bomb, refer to the above video.
Recommended races for this build are Khajiit, Breton, Altmer and Dunmer.
Recommended Mundus Stone is The Shadow.
Recommended potions for this build will either be a Spell Power Potion (AP bought or Crafted) or an Essence of Immovability.
Recommended food for this build will be Ghastly Eye Bowl or Witchmother's Potent Brew.
Vampire can certainly be an option depending on how you want to go about things.