Other winners include the CBC podcast Personal Best and the indie game Balatro.
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The winners will be revealed on May 2 during the Hot Docs Awards Presentation & Reception.
For winning, Choi will receive $15,000 and support from a script consultant, among other prizes.
Jeff Warren and Yves Langlois were selected for the Lifetime Achievement Award while Gregor Hutchison was selected for the Career Achievement Award.
Among the nominees is Olunike Adeliyi for her work in Karen Chapman’s Village Keeper.
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The OYA Media Group and NFB coproduction has won the Portrait Documentary Competition at the 49th edition of the Cleveland International Film Festival.
The award was originally known as the ACTRA National Woman of the Year Award.
The organization has also named the recipient for its ACTRA Toronto Stunt Award.
Zimmer will also take part in a panel session alongside members of Bleeding Fingers Music, the composer collective he co-founded.
Other winners at this year’s Canadian Film Fest include Nik Sexton’s Skeet and Sarah Galea-Davis for The Players.