I'm not positive there are security cameras all over the place. Most of the main road (Mayor Aiken Drive) that cuts though the park north and south is wooded.
Google Maps
Basically 3 ways to exit from the area behind the buildings near the playground, IMO if that's where the vehicle was parked. Seems the most likely place.
1) Burt St - Red SUV seen on camera there, so likely not taken.
2) Babe Ruth Drive to Scholastic Drive - passes back of high school, so high
likelihood of cameras. Again, not a good choice.
3) Babe Ruth Drive to Mayor Aiken Drive - north bound on MA Drive is all
woods ands passes the zoo and then Sunset Lake area. Probably cameras at
the zoo to protect the animals, but do they face the main road? Left on Park
shows still wooded areas.
Not totally impossible for a vehicle to leave the area without showing up on surveillance video. And there are lots of back ways, neighborhood streets to cut through to get to a main way out - route 49 (E-W) or route 77 N-S), to name a couple.