Steps To Reproduce:

1. Create a project
2. Import Vuforia Samples from Asset Store
3. Import Vuforia Package if not already installed.
4. Switch platform to Android.
5. Build and run on an Android device.

Expected Result: Camera permission popup appears and on accepting, camera opens up.

Observed Result: On giving the camera permission, black screen appears.

Note:
Till unity 2019.0f1, default Vuforia version is 8.0.10

Using Vuforia 8.1.7

1. Working with 2019.1.0b5 to 2019.1.0f1, however, not working with 2019.1.0f2 on OnePlus 3 | OS 8.0.0 |
2. Not working with 2019.1.0b5 to 2019.1.0f2 on Samsung Note 9 | OS 9.0.0
3. Not working with 2019.1.0b5 to 2019.1.0f2 on Google Pixel 3 | OS 9.0.0
4. Working with 2019.1.f2 on Samsung S7 | OS 8.0.0

Using Vuforia 8.0.10

1. Working with 2019.1.0b5 to 2019.1.0b6, however, not working with 2019.1.0b7 to 2019.1.0f2 on OnePlus 3 | OS 8.0.0 |
2. Not working with 2019.1.0b5 to 2019.1.0f2 on Samsung Note 9 | OS 9.0.0
3. Not working with 2019.1.0b5 to 2019.1.0f2 on Google Pixel 3 | OS 9.0.0

Stack Trace:

2019-04-12 20:18:52.845 1335-1365/? W/ActivityTaskManager: Activity pause timeout for ActivityRecord{4c4d685 u0 com.Comsgany.Pfghj/com.unity3d.player.UnityPlayerActivity t62}
2019-04-12 20:18:56.348 5660-5660/? W/Unity: Timeout while trying to pause the Unity Engine.
2019-04-12 20:18:56.350 1335-1496/? I/InputDispatcher: Window '1d6e606 com.Comsgany.Pfghj/com.unity3d.player.UnityPlayerActivity (server)' spent 3391.7ms processing the last input event: MotionEvent(deviceId=2, source=0x00001002, displayId=0, action=DOWN, actionButton=0x00000000, flags=0x00000000, metaState=0x00000000, buttonState=0x00000000, classification=NONE, edgeFlags=0x00000000, xPrecision=1.0, yPrecision=1.0, pointers=[0: (441.0, 1321.0)]), policyFlags=0x62000000
2019-04-12 20:18:56.350 1335-1496/? I/InputDispatcher: Window '1d6e606 com.Comsgany.Pfghj/com.unity3d.player.UnityPlayerActivity (server)' spent 3296.9ms processing the last input event: MotionEvent(deviceId=2, source=0x00001002, displayId=0, action=MOVE, actionButton=0x00000000, flags=0x00000000, metaState=0x00000000, buttonState=0x00000000, classification=NONE, edgeFlags=0x00000000, xPrecision=1.0, yPrecision=1.0, pointers=[0: (443.0, 1323.0)]), policyFlags=0x62000000
2019-04-12 20:18:56.350 1335-1496/? I/InputDispatcher: Window '1d6e606 com.Comsgany.Pfghj/com.unity3d.player.UnityPlayerActivity (server)' spent 3289.4ms processing the last input event: MotionEvent(deviceId=2, source=0x00001002, displayId=0, action=MOVE, actionButton=0x00000000, flags=0x00000000, metaState=0x00000000, buttonState=0x00000000, classification=NONE, edgeFlags=0x00000000, xPrecision=1.0, yPrecision=1.0, pointers=[0: (445.0, 1326.0)]), policyFlags=0x62000000
2019-04-12 20:18:56.350 1335-1496/? I/InputDispatcher: Window '1d6e606 com.Comsgany.Pfghj/com.unity3d.player.UnityPlayerActivity (server)' spent 3274.1ms processing the last input event: MotionEvent(deviceId=2, source=0x00001002, displayId=0, action=UP, actionButton=0x00000000, flags=0x00000000, metaState=0x00000000, buttonState=0x00000000, classification=NONE, edgeFlags=0x00000000, xPrecision=1.0, yPrecision=1.0, pointers=[0: (445.0, 1326.0)]), policyFlags=0x62000000
2019-04-12 20:18:56.350 5660-5660/? W/UnityMain: type=1400 audit(0.0:41191): avc: denied { read } for name="version" dev="proc" ino=4026532131 scontext=u:r:untrusted_app_27:s0:c181,c256,c512,c768 tcontext=u:object_r:proc_version:s0 tclass=file permissive=0
2019-04-12 20:18:56.357 5660-5660/? W/UnityMain: type=1400 audit(0.0:41193): avc: denied { read } for name="version" dev="proc" ino=4026532131 scontext=u:r:untrusted_app_27:s0:c181,c256,c512,c768 tcontext=u:object_r:proc_version:s0 tclass=file permissive=0

Reproducible On: 2019.2.0f2

Environment: Win and Mac