As I used to play (do) parkour (not freerun, even if I can do some flips), I can advice about weapons:
* there are a lot of stunts which can be performed with one hand, and they will not reduce moving speed of tracer.
* u can make a lot of stunts with pistol (or another one handed weapon) in one's bosom.
* u can perform some stunts with big weapon (rifle) carried on ur back, but it will reduce ur speed and will always bother u.
I can advice u to make classes for tracers, so depending on game mode:
* some of them will preform not much stunts but will have good weapons and armor.
* another class of tracers will have one handed weapons and low armor, but can make most of stunts.
Or another way (may be even better) make player able to customize his weapons and armor right before level starts.
And show him, which stunts he will miss and will be able to perform. Same with armor.
Any way, for me shooting and moving at the same time and moving fast isn't possible.
About trailer, it looks better than gameplay Anyway I advice u to refuse from implementing flips.
There are a lot of vaults to move fast from point A to point B. And parkour hundred times more useful then freerun.