[Bug Report] Bug title

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Describe the bug
When trying to save a video of the Hopper-v2 environment, it stops after a couple (14) of steps with the error:
Process finished with exit code 139 (interrupted by signal 11: SIGSEGV)
I am able to render the environment perfectly (when not capturing) , and the code does work for the Cartpole environment.
In the hopper case, the first 14 frames are captured and saved in the mp4 file though, but I do not understand why the process finishes mid-episode.

Code example

import os
from gym.wrappers.monitoring.video_recorder import VideoRecorder

path_project = os.path.abspath(os.path.join(__file__, ".."))
path_of_video_with_name = os.path.join(path_project, "videotest.mp4")
env = gym.make('Hopper-v2') # for making environment
state = env.reset()
video_recorder = None
video_recorder = VideoRecorder(env, path_of_video_with_name, enabled=True)

for _ in range(1000):
   env.render()
   video_recorder.capture_frame()
   env.step(env.action_space.sample()) # take a random action

print("Saved video.")

video_recorder.close()
video_recorder.enabled = False
env.close()

System Info

I am using Linux 20.0.4 (Ubuntu), Gym version 0.21.0 using pip install gym, python version 3.7.6.

Additional context
Add any other context about the problem here.

Checklist

• I have checked that there is no similar issue in the repo (required)

[jkterry1]

PR #2762 is about to be merged, introducing V4 MuJoCo environments using new bindings and a dramatically newer version of the engine. If this issue still persists with the V4 ones, please create a new issue for it.