If you are having trouble watching videos, it is likely due to your Privacy Protection status being enabled in-game. In order to see all these features, you must enable this mode and "Agree" to the terms.

To enable or disable this feature, in-game, at any time, go to Settings (cog icon top-left of the screen, below the park level), then Help & Support and tap the toggle/slide button "Interest-Based Ads". If it is red, then it is "Disabled", and if it green, then it is "Enabled". Please note: there is a limited amount of videos per day throughout the park. Once you've watched all available videos, more will be available the following day only.

It may also be that your device has an added blocker as well. You can try the following:

-Open your Device Settings > apps
-Locate and tap Google Settings
-Select Ads
-Check Opt out of Ads Personalization and relaunch the game

You may also try here:

-Open device settings > Google Services
-Select the ad tracking option and relaunch the game.