WebCamObjectDetection did not terminate automatically

[TINGWEIJING]

Describe the bug
The program and webcam grabber did not close after user exits the UI. Need to stop the program manually in IDE.

To Reproduce
Steps to reproduce the behavior:

1. Go to dl4j-cv-labs/src/main/java/ai/certifai/solution/object_detection/WebCamObjectDetection.java
2. Run the java file
3. Wait for the webcam to turn on
4. Press "Q" to close the UI

Expected behavior
The program should terminate after user press "Q".

Desktop:

• OS: Windows 10 Pro
• Version: 10.0.19042 Build 19042

[github-actions]

👋 @TINGWEIJING
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