Amazon Fire stick is a modified version of Android, so you can install Android apps on it. But not all apps might work due to compatibility issues.
Ustream is a Video Players & Editors android app developed by Ustream an IBM Company. The latest version is 3.2.2 and the it requires a 4.1 android version to run it. Watch live video and broadcast live on your phone or tablet - anytime, anywhere! • Watch live and recent videos, discover upcoming events • Broadcast live to any number of viewers using the camera of your device • Manage and re-share your Ustream recorded videos • Interact with your audience by chatting • Access your followed Ustream channels and events that you’re attending • Enjoy your Ustream Premium Membership ad-free experience on your device • Go live right from your Home Screen using the new Quick Broadcast widget HD Broadcasting Broadcasting in 720p HD and 360p HQ is available on the following devices: • All Android 6.0 or newer device • LG Optimus F6 • Samsung Galaxy S4 • Sony Xperia L • LG Nexus 4 • LG Leon • Samsung Galaxy Note 4 • Samsung Galaxy S6 Edge • Verizon HTC One • Verizon HTC One Max • Verizon LG G2 • Verizon Samsung Galaxy S5 • Verizon Samsung Galaxy S4 • Verizon Samsung Galaxy S3 • Verizon Samsung Galaxy S4 Mini • Verizon Samsung Galaxy S3 Mini • Verizon Samsung Galaxy Note 2 • Verizon Samsung Galaxy Note 3 • Verizon Motorola Razr M • Verizon Motorola Razr Maxx • Verizon Motorola Razr HD • Verizon Motorola Droid DNA • Verizon Motorola Droid Ultra. Ustream was released 4 years ago, and is available for Free.