Question about motion tracking.

my customer want to use mobile camera to track arm swing front and back but i have 0 knowledge about it .

i have read a lot of forums but they ask about hand tracking and about delicate hand movement.

and almost all of them said right now don’t have asset or script to do that.

i want to use some thing like face filter to detect my arm.

can i make it?

and if i can what i have to use to make it come true?

some one told me to use vuforia to make it is easiest way to make but the quality is may be not past what customer want.

and better don’t take this job.